WO2015093077A1 - Liquid-crystal display for heads-up display, and heads-up display - Google Patents

Liquid-crystal display for heads-up display, and heads-up display Download PDF

Info

Publication number
WO2015093077A1
WO2015093077A1 PCT/JP2014/064994 JP2014064994W WO2015093077A1 WO 2015093077 A1 WO2015093077 A1 WO 2015093077A1 JP 2014064994 W JP2014064994 W JP 2014064994W WO 2015093077 A1 WO2015093077 A1 WO 2015093077A1
Authority
WO
WIPO (PCT)
Prior art keywords
polarizing plate
liquid crystal
display device
crystal display
light
Prior art date
Application number
PCT/JP2014/064994
Other languages
French (fr)
Japanese (ja)
Inventor
吉田　哲志
山口　稔
大沢　和彦
楠野　哲也
Original Assignee
株式会社オルタステクノロジー
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社オルタステクノロジー filed Critical 株式会社オルタステクノロジー
Priority to KR1020167016318A priority Critical patent/KR20160088397A/en
Priority to CN201480069218.0A priority patent/CN105829947B/en
Priority to EP14871610.3A priority patent/EP3086169B1/en
Publication of WO2015093077A1 publication Critical patent/WO2015093077A1/en
Priority to US15/184,234 priority patent/US10067343B2/en

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133302—Rigid substrates, e.g. inorganic substrates
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/121—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode common or background
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/123—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode pixel
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/01—Number of plates being 1
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/05—Single plate on one side of the LC cell
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
    • G02F2413/08—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates with a particular optical axis orientation

Definitions

  • the present invention relates to a liquid crystal display device for a head-up display device and a head-up display device, and more particularly to a head-up display device using the liquid crystal display device.
  • a head-up display (HUD) device that displays a virtual image (display image) by projecting display light from a liquid crystal display device on a windshield of a vehicle is known.
  • display light transmitted through a liquid crystal display device by illumination light from a backlight is reflected by a reflecting mirror (or concave mirror), and the reflected light is projected onto a display member such as a windshield or a combiner.
  • a reflecting mirror or concave mirror
  • the head-up display device due to its structure, a part of the external light (external light) such as sunlight (particularly the light component parallel to the light path of the backlight and opposite) is used in the liquid crystal used in the head-up display device.
  • the display device may be irradiated. In this case, an unnecessary image that should not be displayed is displayed on the windshield due to the external light reflected by the display surface of the liquid crystal display device. As a result, the display characteristics of the liquid crystal display device deteriorate.
  • the present invention provides a liquid crystal display device for a head-up display device and a head-up display device capable of improving the display characteristics by increasing the intensity of light transmitted through the liquid crystal display element.
  • a liquid crystal display device for a head-up display device includes a light source unit including a reflective film provided on a substrate, a light emitting element, a first polarizing plate provided on the light source unit side, A liquid crystal display element having a first polarizing plate and a second polarizing plate disposed opposite to each other with a liquid crystal layer interposed therebetween, and provided between the reflective film and the first polarizing plate, and having a wavelength of ⁇ / 4.
  • a phase difference plate for providing a phase difference; a reflection type polarizing plate that is provided between the phase difference plate and the first polarizing plate and reflects a light component parallel to a reflection axis; the reflection type polarizing plate; And a diffusing member that diffuses light and is provided between the polarizing plate and the polarizing plate.
  • a liquid crystal display device for a head-up display device includes a light source unit having a light emitting element provided on a substrate, a first polarizing plate provided on the light source unit side, and the first polarizing plate. And a second polarizing plate disposed opposite to each other via a liquid crystal layer, and a phase difference that is provided between the light source unit and the first polarizing plate and gives a phase difference of ⁇ / 4 to light
  • a reflection plate that is provided between the reflection plate, the retardation plate, and the first polarizing plate, and reflects a light component parallel to the reflection axis; and between the reflection polarizing plate and the first polarizing plate.
  • a diffusing member for diffusing light.
  • a liquid crystal display device for a head-up display device includes a light source unit including a reflective film provided on a substrate, a light emitting element, a first polarizing plate provided on the light source unit side, A liquid crystal display element having a first polarizing plate and a second polarizing plate arranged opposite to each other with a liquid crystal layer interposed therebetween, and a light component parallel to the reflection axis provided between the reflective film and the first polarizing plate A reflective polarizing plate that reflects light, and a diffusion member that is provided between the reflective polarizing plate and the first polarizing plate and diffuses light.
  • a liquid crystal display device for a head-up display device includes a light source unit having a light emitting element provided on a substrate, a first polarizing plate provided on the light source unit side, and the first polarizing plate. And a second polarizing plate disposed opposite to each other with a liquid crystal layer interposed therebetween, and a reflective type that is provided between the light source unit and the first polarizing plate and reflects a light component parallel to the reflection axis A polarizing plate, and a diffusion member provided between the reflective polarizing plate and the first polarizing plate and diffusing light are provided.
  • a liquid crystal display device for a head-up display device and a head-up display device capable of improving display characteristics by increasing the intensity of light transmitted through the liquid crystal display element.
  • FIG. 1 is a cross-sectional view schematically showing a head-up display device according to a first embodiment.
  • Sectional drawing of the liquid crystal display element and light source part which concern on 1st Embodiment.
  • the top view of a light source part Sectional drawing of the liquid crystal display element which concerns on the modification of 1st Embodiment, and a light source part.
  • Sectional drawing of the liquid crystal display element and light source part which concern on 2nd Embodiment Sectional drawing of the liquid crystal display element and light source part which concern on the modification of 2nd Embodiment. Sectional drawing of the liquid crystal display element and light source part which concern on 3rd Embodiment. Sectional drawing of the liquid crystal display element which concerns on the modification of 3rd Embodiment, and a light source part. Sectional drawing of the liquid crystal display element which concerns on 4th Embodiment, and a light source part. Sectional drawing of the liquid crystal display element which concerns on the modification of 4th Embodiment, and a light source part.
  • FIG. 1 is a cross-sectional view schematically showing a head-up display device 100 according to the first embodiment of the present invention.
  • the head-up display device 100 includes a liquid crystal display device 10, a reflecting member 13, and a display member 14.
  • the liquid crystal display device 10 includes a liquid crystal display element 11 and a light source unit 12.
  • the light source unit 12 is composed of a light source having a surface shape (surface light source), for example, and supplies illumination light to the liquid crystal display element 11.
  • a white light emitting diode (LED) is used as the light emitting element included in the light source unit 12.
  • the liquid crystal display element 11 transmits the illumination light from the light source unit 12 and performs light modulation.
  • the liquid crystal display element 11 displays an image indicating driving information such as the vehicle speed.
  • the reflecting member 13 is composed of, for example, a reflecting mirror, specifically, a planar mirror or a concave mirror.
  • the reflecting mirror 13 reflects the display light from the liquid crystal display element 11 toward the display member 14.
  • a concave mirror is used as the reflecting mirror 13
  • the concave mirror expands display light from the liquid crystal display element 11 at a predetermined magnification, for example.
  • the reflection angle at the reflecting mirror (for example, the plane mirror) 13 is (90 ° ⁇ 2 ⁇ ), that is, the angle formed between the incident light and the reflected light at the plane mirror 13 is ( 180 ° -4 ⁇ ). Further, the reflection angle at the display member 14 is ⁇ , that is, the angle formed between the incident light and the reflected light at the display member 14 is 2 ⁇ .
  • the display member 14 is used for projecting display light emitted from the liquid crystal display element 11, and displays the display light as a virtual image 16 by reflecting the display light to the driver.
  • the display member 14 is, for example, a vehicle windshield.
  • the display member 14 may be a translucent screen (combiner) provided exclusively for the head-up display device 100.
  • the combiner is used on a dashboard of a vehicle, mounted on a rearview mirror disposed in front of the driver 15, or mounted on a sun visor installed on an upper portion of a windshield.
  • the combiner is composed of, for example, a transparent base material having a curved surface (for example, synthetic resin) and a vapor deposition film made of titanium oxide, silicon oxide, or the like formed on the surface of the base material. It has a function.
  • the illumination light emitted from the light source unit 12 is transmitted through the liquid crystal display element 11 and light-modulated.
  • the display light transmitted through the liquid crystal display element 11 is reflected by the reflecting mirror 13 and projected onto the display member 14.
  • a virtual image (display image) 16 obtained by projecting display light onto the display member 14 is visually recognized by the driver 15. Accordingly, the driver 15 can observe the virtual image 16 displayed in front of the driver's seat in a superimposed manner with the scenery.
  • a part of the external light is transmitted through the display member 14, reflected by the reflecting mirror 13, and irradiated on the liquid crystal display element 11.
  • the external light is various light incident from the outside of the display member 14 (the side opposite to the side where the liquid crystal display element 11 is disposed), and is light from the outside such as sunlight.
  • the display surface of the liquid crystal display element 11 and the emission surface of the light source unit 12 are substantially parallel, the light reflected by the liquid crystal display element 11 has an optical path opposite to that of external light. And projected onto the display member 14.
  • the display surface (substrate surface) of the liquid crystal display element 11 is a surface on which an image light-modulated by the liquid crystal display element 11 is displayed.
  • FIG. 2 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to the first embodiment.
  • the liquid crystal display element 11 includes a pair of substrates 20 and 21, a liquid crystal layer 22, a sealing material 29 for sealing the liquid crystal layer 22 between the substrate 20 and the substrate 21, a pair of polarizing plates 30 and 31, and diffusion A member 32, a reflective polarizing plate 33, and a retardation plate ( ⁇ / 4 plate) 34 are provided.
  • FIG. 3 is a cross-sectional view showing a more specific configuration example of the liquid crystal display element 11.
  • members between the polarizing plates 30 and 31 are extracted and shown.
  • the liquid crystal display element 11 includes a TFT substrate 20 on which a switching transistor and a pixel electrode are formed, a color filter substrate (CF substrate) 21 on which a color filter and a common electrode are formed and opposed to the TFT substrate 20, and a TFT substrate. 20 and a liquid crystal layer 22 sandwiched between the CF substrate 21.
  • Each of the TFT substrate 20 and the CF substrate 21 is composed of a transparent substrate (for example, a glass substrate).
  • the CF substrate 21 is disposed to face the light source unit 12, and illumination light from the light source unit 12 enters the liquid crystal display element 11 from the CF substrate 21 side.
  • the surface of the TFT substrate 20 opposite to the light source unit 12 is the display surface of the liquid crystal display element 11.
  • the liquid crystal layer 22 is composed of a liquid crystal material sealed by a sealing material 29 for bonding the TFT substrate 20 and the CF substrate 21 together.
  • the alignment of the liquid crystal molecules is manipulated according to the electric field applied between the TFT substrate 20 and the CF substrate 21, and the optical characteristics change.
  • the liquid crystal mode for example, a VA (Vertical Alignment) mode is used, but of course, other liquid crystal modes such as a TN (Twisted ⁇ ⁇ ⁇ Nematic) mode and a homogeneous mode may be used.
  • a plurality of switching transistors 23 are provided on the TFT substrate 20 on the liquid crystal layer 22 side.
  • a thin film transistor TFT: Thin Film Transistor
  • the switching transistor 23 includes a gate electrode electrically connected to a scanning line (not shown), a gate insulating film provided on the gate electrode, and a semiconductor layer (for example, an amorphous silicon layer) provided on the gate insulating film. And a source electrode and a drain electrode provided on the semiconductor layer so as to be separated from each other.
  • the source electrode is electrically connected to a signal line (not shown).
  • An insulating layer 24 is provided on the switching transistor 23.
  • a plurality of pixel electrodes 25 are provided on the insulating layer 24.
  • a contact plug 26 electrically connected to the pixel electrode 25 is provided in the insulating layer 24 and on the drain electrode of the switching transistor 23.
  • a color filter 27 is provided on the CF substrate 21 on the liquid crystal layer 22 side.
  • the color filter 27 includes a plurality of coloring filters (coloring members), and specifically includes a plurality of red filters 27-R, a plurality of green filters 27-G, and a plurality of blue filters 27-B.
  • a general color filter is composed of three primary colors of light, red (R), green (G), and blue (B).
  • a set of three colors R, G, and B adjacent to each other is a display unit (referred to as a pixel or a pixel), and any single color portion of R, G, or B in one pixel is a subpixel (subpixel). This is a minimum drive unit called a pixel.
  • the switching transistor 23 and the pixel electrode 25 are provided for each subpixel.
  • a black matrix (light-shielding film) BM for light shielding is provided at the boundary between the red filter 27-R, the green filter 27-G, and the blue filter 27-B and the boundary between the pixels (sub-pixels). That is, the black matrix BM is formed in a mesh shape.
  • the black matrix BM is provided, for example, to shield unnecessary light between the coloring members and improve contrast.
  • a common electrode 28 is provided on the color filter 27 and the black matrix BM.
  • the common electrode 28 is formed in a planar shape over the entire display area of the liquid crystal display element 11.
  • the polarizing plates 30 and 31 are provided so as to sandwich the TFT substrate 20 and the CF substrate 21.
  • the polarizing plates 30 and 31 have a transmission axis and an absorption axis orthogonal to each other in a plane orthogonal to the light traveling direction.
  • the polarizing plates 30 and 31 transmit linearly polarized light (linearly polarized light component) having a vibration surface parallel to the transmission axis out of light having vibration surfaces in random directions, and have a vibration surface parallel to the absorption axis. Absorbs linearly polarized light (linearly polarized light component).
  • the polarizing plates 30 and 31 are arranged so that their transmission axes are orthogonal to each other, that is, in an orthogonal Nicol state.
  • the pixel electrode 25, the contact plug 26, and the common electrode 28 are made of transparent electrodes, and for example, ITO (indium tin oxide) is used.
  • ITO indium tin oxide
  • a transparent insulating material is used, for example, silicon nitride (SiN).
  • a diffusion member 32 is provided on the surface of the polarizing plate 30 opposite to the TFT substrate 20.
  • the diffusing member 32 has a function of making the transmitted light uniform by diffusing (scattering) the transmitted light in a random direction.
  • the diffusion member 32 is composed of a diffusion adhesive material, a diffusion film, a diffusion plate, or the like.
  • the diffusion adhesive material has a function of attaching the polarizing plate 30 and the reflective polarizing plate 33 in addition to the function of diffusing incident light.
  • the haze value (haze value) of the diffusing member 32 is set, for example, in the range of 60% or more and 95% or less.
  • a reflective polarizing plate 33 is provided on the surface of the diffusing member 32 opposite to the polarizing plate 30.
  • the reflective polarizing plate 33 has a transmission axis and a reflection axis that are orthogonal to each other in a plane orthogonal to the traveling direction of light.
  • the reflective polarizing plate 33 transmits linearly polarized light (linearly polarized light component) having a vibration surface parallel to the transmission axis out of light having a vibration surface in a random direction and has a vibration surface parallel to the reflection axis. Reflects linearly polarized light (linearly polarized light component).
  • the transmission axis of the reflective polarizing plate 33 is set parallel to the transmission axis of the polarizing plate 30. Examples of the reflective polarizing plate 33 include DBM (Dual Brightness Enhancement Film) manufactured by 3M Company, Asahi Kasei Wire Grid Polarizer, and the like.
  • a retardation plate ( ⁇ / 4 plate) 34 is provided on the surface of the reflective polarizing plate 33 opposite to the diffusion member 32.
  • the phase difference plate 34 has refractive index anisotropy, and has a slow axis and a fast axis that are perpendicular to each other in a plane perpendicular to the traveling direction of light.
  • the phase difference plate 34 has a function of giving a predetermined retardation (a phase difference of ⁇ / 4 when ⁇ is a wavelength of light transmitted) between light of a predetermined wavelength that transmits the slow axis and the fast axis. have. That is, the phase difference plate 34 is composed of a ⁇ / 4 plate.
  • the slow axis of the retardation plate 34 is set so as to form an angle of 45 ° with respect to the transmission axis of the reflective polarizing plate 33.
  • plan view of the polarizing plate, the reflective polarizing plate, and the retardation plate in FIG. 2 shows a plane viewed from the light source unit 12 side.
  • the angle of the transmission axis of the polarizing plate 30 with respect to the horizontal direction is denoted as ⁇ .
  • the angle ⁇ can be arbitrarily set.
  • FIG. 4 is a plan view of the light source unit 12 viewed from the liquid crystal display element 11 side.
  • the light source unit 12 includes a substrate 40, a plurality of light emitting elements 41, a reflective film (reflecting plate) 42, and a case 43.
  • a plurality of light emitting elements 41 are provided on the substrate 40.
  • Each light emitting element 41 is composed of, for example, a white LED. In FIG. 4, four light emitting elements 41 are shown as an example. However, the number of light emitting elements 41 can be arbitrarily designed, and the number of light emitting elements 41 may be one, or a plurality other than four. It may be.
  • the substrate 40 is composed of a circuit board provided with wiring for supplying power to the light emitting element 41.
  • the surface of the substrate 40 is disposed in parallel with the surface of the TFT substrate 20 or the CF substrate 21 of the liquid crystal display element 11.
  • a reflective film 42 is provided in a region on the substrate 40 where the light emitting element 41 is not provided. That is, the reflective film 42 has a plurality of openings each having substantially the same planar shape as the plurality of light emitting elements 41.
  • the reflective film 42 reflects light incident from the liquid crystal display element 11 side again to the liquid crystal display element 11 side.
  • a case 43 surrounding the light emitting elements 41 and the reflective film 42 is provided on the substrate 40.
  • the external shapes of the substrate 40 and the case 43 are, for example, rectangular.
  • the illumination light emitted from the light emitting element 41 passes through the phase difference plate 34 and enters the reflective polarizing plate 33.
  • the reflective polarizing plate 33 transmits a light component parallel to the transmission axis and reflects a light component parallel to the reflection axis.
  • the linearly polarized light that has passed through the reflective polarizing plate 33 enters the diffusing member 32.
  • the linearly polarized light reflected by the reflective polarizing plate 33 passes through the phase difference plate 34 and becomes circularly polarized light. Subsequently, the circularly polarized light transmitted through the phase difference plate 34 is reflected mainly by the reflective film 42 to become circularly polarized light in the reverse direction, and is transmitted through the phase difference plate 34 again. That is, the linearly polarized light reflected by the reflective polarizing plate 33 passes through the phase difference plate 34 twice, and thus rotates 90 °. As a result, the linearly polarized light that has passed through the retardation plate 34 twice is parallel to the transmission axis of the reflective polarizing plate 33, and thus passes through the reflective polarizing plate 33.
  • the illumination light emitted from the light emitting element 41 can be transmitted through the reflective polarizing plate 33.
  • the linearly polarized light transmitted through the reflective polarizing plate 33 is diffused by the diffusing member 32 and the uniformity (in-plane uniformity) is improved.
  • the light that should originally be absorbed by the polarizing plate 30 can be reused as a display.
  • transmits the liquid crystal display element 11 can be enlarged, and most illumination light from the light emitting element 41 can be displayed and utilized. Thereafter, the display light transmitted through the liquid crystal display element 11 is visually recognized as a virtual image 16 by the driver 15 through the display member 14.
  • FIG. 5 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to a modification of the first embodiment.
  • a laminated structure including the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 is provided in the light source unit 12.
  • the phase difference plate 34, the reflective polarizing plate 33, and the diffusing member 32 are sequentially stacked above the light emitting element 41 and on the case 43. That is, the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 are incorporated in the light source unit 12.
  • the sizes of the diffusing member 32, the reflective polarizing plate 33, and the retardation film 34 are the same as the size of the case 43, for example.
  • the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 are laminated in order from the liquid crystal display element 11 between the liquid crystal display element 11 and the light source unit 12. Insert the laminated structure.
  • the light source unit 12 is provided with a reflective film 42 that reflects the light reflected by the reflective polarizing plate 33 to the liquid crystal display element 11 side again.
  • the illumination light emitted from the light source unit 12 can be incident on the liquid crystal layer 22. Thereby, the brightness
  • the power consumption of the head-up display device 100 can be reduced.
  • a diffusing member 32 for making the light uniform is provided between the polarizing plate 30 and the reflective polarizing plate 33. Thereby, light with improved uniformity can be incident on the liquid crystal layer 22, so that the display characteristics of the liquid crystal display element 11 can be improved.
  • FIG. 6 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to Comparative Example 1.
  • the light source unit 12 in order to improve the in-plane uniformity of illumination light emitted from the light emitting element 41, the light source unit 12 includes a diffusing member 32, which is above the light emitting element 41 and on the case 43. Is provided.
  • the haze value of the diffusion member 32 of Comparative Example 1 is, for example, 93%.
  • the liquid crystal display element 11 includes a reflective polarizing plate 33 provided on the surface of the polarizing plate 30 opposite to the TFT substrate 20.
  • the illumination light emitted from the light emitting element 41 is made uniform by the diffusing member 32 and then enters the reflective polarizing plate 33. Then, the linearly polarized light transmitted through the reflective polarizing plate 33 (linearly polarized light parallel to the transmission axis of the reflective polarizing plate 33) passes through the polarizing plate 30 and enters the liquid crystal layer 22.
  • the linearly polarized light reflected by the reflective polarizing plate 33 (linearly polarized light parallel to the reflection axis of the reflective polarizing plate 33) is diffused by the diffusing member 32.
  • a part of the light diffused by the diffusing member 32 is reflected toward the liquid crystal display element 11 and passes through the reflective polarizing plate 33.
  • the luminance of the liquid crystal display element 11 is improved by providing the light source unit 12 with the diffusing member 32.
  • FIG. 7 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to Comparative Example 2.
  • the light source unit 12 includes a reflective film 42 provided on the substrate 40.
  • Other configurations are the same as those of Comparative Example 1 in FIG.
  • FIG. 8 is a diagram for explaining white luminance in Comparative Example 1 (FIG. 6), Comparative Example 2 (FIG. 7), and Example (first embodiment of FIG. 2).
  • the white luminance in FIG. 8 is a numerical value by the display light of the liquid crystal display element 11. Assuming that the white luminance in Comparative Example 1 is 100, the white luminance in Comparative Example 2 is 109, and the white luminance is somewhat improved by providing the light source unit 12 with the reflective film 42. Furthermore, by using the configuration of the example (first embodiment of FIG. 2), white luminance can be improved by 70% compared to the comparative example 1.
  • the retardation plate ( ⁇ / 4 plate) 34 is removed, and the luminance of the liquid crystal display element 11 is improved by using the diffusing member 32, the reflective polarizing plate 33, and the reflective film 42. .
  • FIG. 9 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to the second embodiment of the present invention.
  • the phase difference plate ( ⁇ / 4 plate) 34 is removed as compared with FIG. 2 of the first embodiment.
  • Other configurations in FIG. 9 are the same as those in FIG.
  • the illumination light emitted from the light emitting element 41 enters the reflective polarizing plate 33.
  • the linearly polarized light transmitted through the reflective polarizing plate 33 enters the diffusing member 32, while the linearly polarized light reflected by the reflective polarizing plate 33 is mainly reflected by the reflective film 42 of the light source unit 12.
  • the reflected light reflected by the reflective film 42 includes a light component whose polarization state is disturbed, and a light component parallel to the transmission axis of the reflective polarizing plate 33 is also generated. This light component is transmitted through the reflective polarizing plate 33.
  • the linearly polarized light transmitted through the reflective polarizing plate 33 is diffused by the diffusing member 32 and the uniformity is improved.
  • the liquid crystal display element 11 is provided with the reflective polarizing plate 33 and the diffusing member 32, and the light source unit 12 is provided with the reflective film 42.
  • luminance of the liquid crystal display element 11 can be improved.
  • the configuration of the second embodiment can reduce the manufacturing cost.
  • FIG. 10 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to a modification of the second embodiment.
  • the laminated structure including the diffusion member 32 and the reflective polarizing plate 33 is provided in the light source unit 12.
  • the reflective polarizing plate 33 and the diffusing member 32 are sequentially laminated above the light emitting element 41 and on the case 43. That is, the diffusing member 32 and the reflective polarizing plate 33 are incorporated in the light source unit 12.
  • Other configurations are the same as those of the second embodiment described above.
  • the optical path and the polarization state of the illumination light emitted from the light emitting element 41 are the same as those in the second embodiment described above.
  • the reflection film 42 provided on the light source unit 12 is removed, and the liquid crystal display element 11 is formed by using the diffusion member 32, the reflective polarizing plate 33, and the retardation plate ( ⁇ / 4 plate) 34.
  • the brightness is improved.
  • FIG. 11 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to the third embodiment of the present invention.
  • the liquid crystal display element 11 of the third embodiment has the same configuration as the liquid crystal display element 11 shown in FIG. 2 of the first embodiment.
  • the reflective film 42 is removed as compared with FIG. 2 of the first embodiment.
  • the substrate 40 of the light source unit 12 has a flat surface having light reflectivity, that is, a reflective surface that reflects light.
  • the substrate 40 is disposed so that the reflection surface thereof faces the liquid crystal display element 11.
  • substrate 40 is comprised from a glass epoxy board
  • the linearly polarized light reflected by the reflective polarizing plate 33 passes through the phase difference plate 34 and becomes circularly polarized light. Subsequently, the circularly polarized light transmitted through the phase difference plate 34 is mainly reflected by the substrate 40 to become circularly polarized light in the reverse direction, and is transmitted through the phase difference plate 34 again. As a result, the linearly polarized light that has passed through the retardation plate 34 twice is parallel to the transmission axis of the reflective polarizing plate 33, and thus passes through the reflective polarizing plate 33. The linearly polarized light transmitted through the reflective polarizing plate 33 is diffused by the diffusing member 32 and the uniformity is improved.
  • the reflected light reflected by the reflective polarizing plate 33 is reflected by the substrate 40 of the light source unit 12.
  • luminance of the liquid crystal display element 11 can be improved.
  • the configuration of the third embodiment can reduce the manufacturing cost.
  • FIG. 12 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to a modification of the third embodiment.
  • a laminated structure including the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 is provided in the light source unit 12.
  • phase difference plate 34, the reflective polarizing plate 33, and the diffusing member 32 are sequentially stacked above the light emitting element 41 and on the case 43. That is, the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 are incorporated in the light source unit 12.
  • Other configurations are the same as those of the third embodiment described above.
  • the optical path and the polarization state of the illumination light emitted from the light emitting element 41 are the same as those in the third embodiment described above.
  • the phase difference plate ( ⁇ / 4 plate) 34 and the reflection film 42 provided in the light source unit 12 are removed, and a liquid crystal display element using a diffusion member 32 and a reflection type polarizing plate 33 is used. 11 brightness is improved.
  • FIG. 13 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to the fourth embodiment of the present invention.
  • the liquid crystal display element 11 of the fourth embodiment has the same configuration as the liquid crystal display element 11 shown in FIG. 9 of the second embodiment.
  • the reflective film 42 is removed as compared with FIG. 9 of the second embodiment.
  • the substrate 40 of the light source unit 12 is composed of, for example, a glass epoxy substrate. Although the reflectance of the substrate 40 is lower than that of the reflective film 42, the substrate 40 reflects the linearly polarized light reflected by the reflective polarizing plate 33. In the reflected light reflected by the substrate 40, a light component whose polarization state is disturbed is generated, and a light component parallel to the transmission axis of the reflective polarizing plate 33 is also generated. This light component is transmitted through the reflective polarizing plate 33. The linearly polarized light transmitted through the reflective polarizing plate 33 is diffused by the diffusing member 32 and the uniformity is improved.
  • the liquid crystal display element 11 is provided with the reflective polarizing plate 33 and the diffusing member 32, and the linearly polarized light reflected by the reflective polarizing plate 33 is reflected by the substrate 40 of the light source unit 12. I am doing so. Thereby, the brightness
  • FIG. 14 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to a modification of the fourth embodiment.
  • the laminated structure including the diffusion member 32 and the reflective polarizing plate 33 is provided in the light source unit 12.
  • the reflective polarizing plate 33 and the diffusing member 32 are sequentially laminated above the light emitting element 41 and on the case 43. That is, the diffusing member 32 and the reflective polarizing plate 33 are incorporated in the light source unit 12.
  • Other configurations are the same as those of the fourth embodiment described above.
  • the optical path and the polarization state of the illumination light emitted from the light emitting element 41 are the same as those in the fourth embodiment described above.
  • the present invention is not limited to the embodiment described above, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Further, the above embodiments include inventions at various stages, and are obtained by appropriately combining a plurality of constituent elements disclosed in one embodiment or by appropriately combining constituent elements disclosed in different embodiments. Various inventions can be configured. For example, even if some constituent elements are deleted from all the constituent elements disclosed in the embodiments, the problems to be solved by the invention can be solved and the effects of the invention can be obtained. Embodiments made can be extracted as inventions.
  • DESCRIPTION OF SYMBOLS 100 Head-up display apparatus, 10 ... Liquid crystal display device, 11 ... Liquid crystal display element, 12 ... Light source part, 13 ... Reflector, 14 ... Display member, 15 ... Driver

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Geometry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

This liquid-crystal display (10) for a heads-up display contains a light-source unit (12), a liquid-crystal display element (11), a waveplate (34), a reflective polarizer (33), and a diffusing member (32). The light-source unit (12) has light-emitting elements (41) and reflective films (42) provided on a substrate (40). The liquid-crystal display element (11) has the following: a polarizer (30) provided on the side of said liquid-crystal display element (11) facing the light-source unit (12); and a polarizer (31) positioned opposite said polarizer (30) with a liquid-crystal layer (22) interposed therebetween. The waveplate (34) is provided between the reflective films (42) and the former (30) of the aforementioned polarizers. The reflective polarizer (33) is provided between the waveplate (34) and the former (30) of the abovementioned polarizers. The diffusing member (32) is provided between the reflective polarizer (33) and the former (30) of the abovementioned polarizers.

Description

ヘッドアップディスプレイ装置用液晶表示装置及びヘッドアップディスプレイ装置Liquid crystal display device for head-up display device and head-up display device
　本発明は、ヘッドアップディスプレイ装置用液晶表示装置及びヘッドアップディスプレイ装置に係り、特に液晶表示装置を用いたヘッドアップディスプレイ装置に関する。 The present invention relates to a liquid crystal display device for a head-up display device and a head-up display device, and more particularly to a head-up display device using the liquid crystal display device.
　車両のフロントガラスなどに液晶表示装置からの表示光を投射して虚像（表示像）の表示を行うヘッドアップディスプレイ（ＨＵＤ）装置が知られている。このヘッドアップディスプレイ装置では、例えば、バックライトからの照明光が液晶表示装置を透過した表示光を反射鏡（又は凹面鏡）で反射させ、この反射光をフロントガラス又はコンバイナーなどの表示部材に投射することで、運転者が表示部材に表示された虚像を視認するようになっている。これにより、運転者が運転状態からほとんど視野を動かすことなく情報を読み取ることができる。 2. Description of the Related Art A head-up display (HUD) device that displays a virtual image (display image) by projecting display light from a liquid crystal display device on a windshield of a vehicle is known. In this head-up display device, for example, display light transmitted through a liquid crystal display device by illumination light from a backlight is reflected by a reflecting mirror (or concave mirror), and the reflected light is projected onto a display member such as a windshield or a combiner. Thus, the driver visually recognizes the virtual image displayed on the display member. Thereby, the driver can read information without moving the visual field from the driving state.
　ヘッドアップディスプレイ装置では、その構造上、太陽光等の外部からの光（外光）の一部（特にバックライトの光路に平行で逆向きの光成分）が、ヘッドアップディスプレイ装置に用いられる液晶表示装置に照射されることがある。この場合、液晶表示装置の表示面で反射した外光に起因して、表示されるべきでない不要な像がフロントガラスに映し出される。これにより、液晶表示装置の表示特性が劣化してしまう。 In the head-up display device, due to its structure, a part of the external light (external light) such as sunlight (particularly the light component parallel to the light path of the backlight and opposite) is used in the liquid crystal used in the head-up display device. The display device may be irradiated. In this case, an unnecessary image that should not be displayed is displayed on the windshield due to the external light reflected by the display surface of the liquid crystal display device. As a result, the display characteristics of the liquid crystal display device deteriorate.
　また、液晶表示装置を透過する光の強度（輝度）が小さいと、フロントガラスに投射される虚像が暗くなり、外光に起因する不要な像がより目立つようになる。この結果、液晶表示装置の表示特性が劣化してしまう。 In addition, when the intensity (luminance) of light transmitted through the liquid crystal display device is small, a virtual image projected on the windshield becomes dark, and unnecessary images caused by external light become more noticeable. As a result, the display characteristics of the liquid crystal display device deteriorate.
特開平１０－２２１６９１号公報Japanese Patent Laid-Open No. 10-221691
　本発明は、液晶表示素子を透過する光の強度を大きくすることで、表示特性を向上させることが可能なヘッドアップディスプレイ装置用液晶表示装置及びヘッドアップディスプレイ装置を提供する。 The present invention provides a liquid crystal display device for a head-up display device and a head-up display device capable of improving the display characteristics by increasing the intensity of light transmitted through the liquid crystal display element.
　本発明の一態様に係るヘッドアップディスプレイ装置用液晶表示装置は、基板上に設けられた反射膜と、発光素子とを有する光源部と、前記光源部側に設けられた第１偏光板と、前記第１偏光板と液晶層を介して対向配置された第２偏光板とを有する液晶表示素子と、前記反射膜と前記第１偏光板との間に設けられ、光にλ／４の位相差を与える位相差板と、前記位相差板と前記第１偏光板との間に設けられ、反射軸と平行な光成分を反射する反射型偏光板と、前記反射型偏光板と前記第１偏光板との間に設けられ、光を拡散する拡散部材とを具備することを特徴とする。 A liquid crystal display device for a head-up display device according to an aspect of the present invention includes a light source unit including a reflective film provided on a substrate, a light emitting element, a first polarizing plate provided on the light source unit side, A liquid crystal display element having a first polarizing plate and a second polarizing plate disposed opposite to each other with a liquid crystal layer interposed therebetween, and provided between the reflective film and the first polarizing plate, and having a wavelength of λ / 4. A phase difference plate for providing a phase difference; a reflection type polarizing plate that is provided between the phase difference plate and the first polarizing plate and reflects a light component parallel to a reflection axis; the reflection type polarizing plate; And a diffusing member that diffuses light and is provided between the polarizing plate and the polarizing plate.
　本発明の一態様に係るヘッドアップディスプレイ装置用液晶表示装置は、基板上に設けられた発光素子を有する光源部と、前記光源部側に設けられた第１偏光板と、前記第１偏光板と液晶層を介して対向配置された第２偏光板とを有する液晶表示素子と、前記光源部と前記第１偏光板との間に設けられ、光にλ／４の位相差を与える位相差板と、前記位相差板と前記第１偏光板との間に設けられ、反射軸と平行な光成分を反射する反射型偏光板と、前記反射型偏光板と前記第１偏光板との間に設けられ、光を拡散する拡散部材とを具備することを特徴とする。 A liquid crystal display device for a head-up display device according to one embodiment of the present invention includes a light source unit having a light emitting element provided on a substrate, a first polarizing plate provided on the light source unit side, and the first polarizing plate. And a second polarizing plate disposed opposite to each other via a liquid crystal layer, and a phase difference that is provided between the light source unit and the first polarizing plate and gives a phase difference of λ / 4 to light A reflection plate that is provided between the reflection plate, the retardation plate, and the first polarizing plate, and reflects a light component parallel to the reflection axis; and between the reflection polarizing plate and the first polarizing plate. And a diffusing member for diffusing light.
　本発明の一態様に係るヘッドアップディスプレイ装置用液晶表示装置は、基板上に設けられた反射膜と、発光素子とを有する光源部と、前記光源部側に設けられた第１偏光板と、前記第１偏光板と液晶層を介して対向配置された第２偏光板とを有する液晶表示素子と、前記反射膜と前記第１偏光板との間に設けられ、反射軸と平行な光成分を反射する反射型偏光板と、前記反射型偏光板と前記第１偏光板との間に設けられ、光を拡散する拡散部材とを具備することを特徴とする。 A liquid crystal display device for a head-up display device according to an aspect of the present invention includes a light source unit including a reflective film provided on a substrate, a light emitting element, a first polarizing plate provided on the light source unit side, A liquid crystal display element having a first polarizing plate and a second polarizing plate arranged opposite to each other with a liquid crystal layer interposed therebetween, and a light component parallel to the reflection axis provided between the reflective film and the first polarizing plate A reflective polarizing plate that reflects light, and a diffusion member that is provided between the reflective polarizing plate and the first polarizing plate and diffuses light.
　本発明の一態様に係るヘッドアップディスプレイ装置用液晶表示装置は、基板上に設けられた発光素子を有する光源部と、前記光源部側に設けられた第１偏光板と、前記第１偏光板と液晶層を介して対向配置された第２偏光板とを有する液晶表示素子と、前記光源部と前記第１偏光板との間に設けられ、反射軸と平行な光成分を反射する反射型偏光板と、前記反射型偏光板と前記第１偏光板との間に設けられ、光を拡散する拡散部材とを具備することを特徴とする。 A liquid crystal display device for a head-up display device according to one embodiment of the present invention includes a light source unit having a light emitting element provided on a substrate, a first polarizing plate provided on the light source unit side, and the first polarizing plate. And a second polarizing plate disposed opposite to each other with a liquid crystal layer interposed therebetween, and a reflective type that is provided between the light source unit and the first polarizing plate and reflects a light component parallel to the reflection axis A polarizing plate, and a diffusion member provided between the reflective polarizing plate and the first polarizing plate and diffusing light are provided.
　本発明によれば、液晶表示素子を透過する光の強度を大きくすることで、表示特性を向上させることが可能なヘッドアップディスプレイ装置用液晶表示装置及びヘッドアップディスプレイ装置を提供することができる。 According to the present invention, it is possible to provide a liquid crystal display device for a head-up display device and a head-up display device capable of improving display characteristics by increasing the intensity of light transmitted through the liquid crystal display element.
第１実施形態に係るヘッドアップディスプレイ装置を模式的に示した断面図。1 is a cross-sectional view schematically showing a head-up display device according to a first embodiment. 第１実施形態に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element and light source part which concern on 1st Embodiment. 液晶表示素子のより具体的な構成例を示す断面図。Sectional drawing which shows the more specific structural example of a liquid crystal display element. 光源部の平面図。The top view of a light source part. 第１実施形態の変形例に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element which concerns on the modification of 1st Embodiment, and a light source part. 比較例１に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element which concerns on the comparative example 1, and a light source part. 比較例２に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element which concerns on the comparative example 2, and a light source part. 比較例１、比較例２、及び実施例における白輝度を説明する図。The figure explaining the white brightness | luminance in the comparative example 1, the comparative example 2, and an Example. 第２実施形態に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element and light source part which concern on 2nd Embodiment. 第２実施形態の変形例に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element and light source part which concern on the modification of 2nd Embodiment. 第３実施形態に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element and light source part which concern on 3rd Embodiment. 第３実施形態の変形例に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element which concerns on the modification of 3rd Embodiment, and a light source part. 第４実施形態に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element which concerns on 4th Embodiment, and a light source part. 第４実施形態の変形例に係る液晶表示素子及び光源部の断面図。Sectional drawing of the liquid crystal display element which concerns on the modification of 4th Embodiment, and a light source part.
　以下、実施形態について図面を参照して説明する。ただし、図面は模式的または概念的なものであり、各図面の寸法および比率等は必ずしも現実のものと同一とは限らないことに留意すべきである。また、図面の相互間で同じ部分を表す場合においても、互いの寸法の関係や比率が異なって表される場合もある。特に、以下に示す幾つかの実施形態は、本発明の技術思想を具体化するための装置および方法を例示したものであって、構成部品の形状、構造、配置等によって、本発明の技術思想が特定されるものではない。なお、以下の説明において、同一の機能及び構成を有する要素については同一符号を付し、重複説明は必要な場合にのみ行う。 Hereinafter, embodiments will be described with reference to the drawings. However, it should be noted that the drawings are schematic or conceptual, and the dimensions and ratios of the drawings are not necessarily the same as the actual ones. Further, even when the same portion is represented between the drawings, the dimensional relationship and ratio may be represented differently. In particular, the following embodiments exemplify an apparatus and a method for embodying the technical idea of the present invention, and the technical idea of the present invention depends on the shape, structure, arrangement, etc. of components. Is not specified. In the following description, elements having the same function and configuration are denoted by the same reference numerals, and redundant description will be given only when necessary.
　［第１実施形態］
　［１．ヘッドアップディスプレイ装置１００の構成］
　図１は、本発明の第１実施形態に係るヘッドアップディスプレイ装置１００を模式的に示した断面図である。ヘッドアップディスプレイ装置１００は、液晶表示装置１０、反射部材１３、及び表示部材１４を備える。液晶表示装置１０は、液晶表示素子１１、及び光源部１２を備える。 [First Embodiment]
[1. Configuration of Head-Up Display Device 100]
FIG. 1 is a cross-sectional view schematically showing a head-up display device 100 according to the first embodiment of the present invention. The head-up display device 100 includes a liquid crystal display device 10, a reflecting member 13, and a display member 14. The liquid crystal display device 10 includes a liquid crystal display element 11 and a light source unit 12.
　光源部１２は、例えば面形状を持つ光源（面光源）から構成され、液晶表示素子１１に照明光を供給する。光源部１２に含まれる発光素子としては、例えば白色の発光ダイオード（ＬＥＤ：Light Emitting Diode）が用いられる。液晶表示素子１１は、光源部１２からの照明光を透過して光変調を行う。そして、液晶表示素子１１は、車速等の運転情報を示す画像を表示する。 The light source unit 12 is composed of a light source having a surface shape (surface light source), for example, and supplies illumination light to the liquid crystal display element 11. For example, a white light emitting diode (LED) is used as the light emitting element included in the light source unit 12. The liquid crystal display element 11 transmits the illumination light from the light source unit 12 and performs light modulation. The liquid crystal display element 11 displays an image indicating driving information such as the vehicle speed.
　反射部材１３は、例えば反射鏡から構成され、具体的には、平面鏡、又は凹面鏡などから構成される。反射鏡１３は、液晶表示素子１１からの表示光を表示部材１４に向けて反射する。反射鏡１３として凹面鏡を用いた場合、凹面鏡は、例えば、液晶表示素子１１からの表示光を所定の拡大率で拡大する。 The reflecting member 13 is composed of, for example, a reflecting mirror, specifically, a planar mirror or a concave mirror. The reflecting mirror 13 reflects the display light from the liquid crystal display element 11 toward the display member 14. When a concave mirror is used as the reflecting mirror 13, the concave mirror expands display light from the liquid crystal display element 11 at a predetermined magnification, for example.
　鉛直線（重力方向）に対する表示部材１４の傾きをβとすると、反射鏡（例えば平面鏡）１３における反射角は（９０°－２β）、すなわち平面鏡１３における入射光と反射光とのなす角度は（１８０°－４β）である。また、表示部材１４における反射角はβ、すなわち表示部材１４における入射光と反射光とのなす角度は２βである。 When the inclination of the display member 14 with respect to the vertical line (gravity direction) is β, the reflection angle at the reflecting mirror (for example, the plane mirror) 13 is (90 ° −2β), that is, the angle formed between the incident light and the reflected light at the plane mirror 13 is ( 180 ° -4β). Further, the reflection angle at the display member 14 is β, that is, the angle formed between the incident light and the reflected light at the display member 14 is 2β.
　表示部材１４は、液晶表示素子１１から出射される表示光を投射するために使用され、表示光を運転者へ反射することで、表示光を虚像１６として表示させる。表示部材１４は、例えば車両のフロントガラスである。また、表示部材１４は、ヘッドアップディスプレイ装置１００専用に設けられた半透明なスクリーン（コンバイナー）であってもよい。コンバイナーは、例えば、車両のダッシュボード上に配置されたり、運転者１５の前方に配置されたルームミラーに装着されたり、フロントガラスの上部に設置されたサンバイザーに装着されて使用される。コンバイナーは、例えば、曲面を有する透明な基材（例えば合成樹脂）と、この基材の表面に形成された酸化チタン、酸化シリコンなどからなる蒸着膜とから構成され、この蒸着膜によって半透過の機能を備える。 The display member 14 is used for projecting display light emitted from the liquid crystal display element 11, and displays the display light as a virtual image 16 by reflecting the display light to the driver. The display member 14 is, for example, a vehicle windshield. The display member 14 may be a translucent screen (combiner) provided exclusively for the head-up display device 100. For example, the combiner is used on a dashboard of a vehicle, mounted on a rearview mirror disposed in front of the driver 15, or mounted on a sun visor installed on an upper portion of a windshield. The combiner is composed of, for example, a transparent base material having a curved surface (for example, synthetic resin) and a vapor deposition film made of titanium oxide, silicon oxide, or the like formed on the surface of the base material. It has a function.
　図１の実線で示すように、光源部１２から出射された照明光は、液晶表示素子１１を透過するとともに光変調される。液晶表示素子１１を透過した表示光は、反射鏡１３によって反射され、表示部材１４に投射される。この表示部材１４への表示光の投射によって得られる虚像（表示像）１６が運転者１５に視認される。これにより、運転者１５は、運転席の正面前方に表示される虚像１６を風景と重畳させて観察することができる。 As shown by the solid line in FIG. 1, the illumination light emitted from the light source unit 12 is transmitted through the liquid crystal display element 11 and light-modulated. The display light transmitted through the liquid crystal display element 11 is reflected by the reflecting mirror 13 and projected onto the display member 14. A virtual image (display image) 16 obtained by projecting display light onto the display member 14 is visually recognized by the driver 15. Accordingly, the driver 15 can observe the virtual image 16 displayed in front of the driver's seat in a superimposed manner with the scenery.
　一方で、図１の破線で示すように、外光の一部は、表示部材１４を透過して反射鏡１３によって反射され、液晶表示素子１１に照射される。外光とは、表示部材１４の外側（液晶表示素子１１が配置される側と反対側）から入射する種々の光であり、例えば太陽光等の外部からの光である。この時、液晶表示素子１１の表示面と光源部１２の出射面（照明光が出射する面）とがほぼ平行である場合、液晶表示素子１１により反射された光は、外光と逆の光路を辿り、表示部材１４に投射される。このため、本来、表示されるべきでない不要な像が発生し、運転者１５が視認する表示像の表示品質が低下する。なお、液晶表示素子１１の表示面（基板面）とは、液晶表示素子１１により光変調された画像が表示される面である。 On the other hand, as shown by a broken line in FIG. 1, a part of the external light is transmitted through the display member 14, reflected by the reflecting mirror 13, and irradiated on the liquid crystal display element 11. The external light is various light incident from the outside of the display member 14 (the side opposite to the side where the liquid crystal display element 11 is disposed), and is light from the outside such as sunlight. At this time, when the display surface of the liquid crystal display element 11 and the emission surface of the light source unit 12 (surface from which illumination light is emitted) are substantially parallel, the light reflected by the liquid crystal display element 11 has an optical path opposite to that of external light. And projected onto the display member 14. For this reason, an unnecessary image that should not be displayed is generated, and the display quality of the display image visually recognized by the driver 15 is deteriorated. The display surface (substrate surface) of the liquid crystal display element 11 is a surface on which an image light-modulated by the liquid crystal display element 11 is displayed.
　図２は、第１実施形態に係る液晶表示素子１１及び光源部１２の断面図である。液晶表示素子１１は、一対の基板２０、２１と、液晶層２２と、基板２０及び基板２１間に液晶層２２を封止するためのシール材２９と、一対の偏光板３０、３１と、拡散部材３２と、反射型偏光板３３と、位相差板（λ／４板）３４とを備える。 FIG. 2 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to the first embodiment. The liquid crystal display element 11 includes a pair of substrates 20 and 21, a liquid crystal layer 22, a sealing material 29 for sealing the liquid crystal layer 22 between the substrate 20 and the substrate 21, a pair of polarizing plates 30 and 31, and diffusion A member 32, a reflective polarizing plate 33, and a retardation plate (λ / 4 plate) 34 are provided.
　図３は、液晶表示素子１１のより具体的な構成例を示す断面図である。なお、図３には、偏光板３０、３１間の部材を抽出して示している。 FIG. 3 is a cross-sectional view showing a more specific configuration example of the liquid crystal display element 11. In FIG. 3, members between the polarizing plates 30 and 31 are extracted and shown.
　液晶表示素子１１は、スイッチングトランジスタ及び画素電極等が形成されるＴＦＴ基板２０と、カラーフィルター及び共通電極が形成されかつＴＦＴ基板２０に対向配置されるカラーフィルター基板（ＣＦ基板）２１と、ＴＦＴ基板２０及びＣＦ基板２１間に挟持された液晶層２２とを備える。ＴＦＴ基板２０及びＣＦ基板２１の各々は、透明基板（例えば、ガラス基板）から構成される。ＣＦ基板２１は、光源部１２に対向配置され、光源部１２からの照明光は、ＣＦ基板２１側から液晶表示素子１１に入射する。ＴＦＴ基板２０の光源部１２とは反対側の面が液晶表示素子１１の表示面である。 The liquid crystal display element 11 includes a TFT substrate 20 on which a switching transistor and a pixel electrode are formed, a color filter substrate (CF substrate) 21 on which a color filter and a common electrode are formed and opposed to the TFT substrate 20, and a TFT substrate. 20 and a liquid crystal layer 22 sandwiched between the CF substrate 21. Each of the TFT substrate 20 and the CF substrate 21 is composed of a transparent substrate (for example, a glass substrate). The CF substrate 21 is disposed to face the light source unit 12, and illumination light from the light source unit 12 enters the liquid crystal display element 11 from the CF substrate 21 side. The surface of the TFT substrate 20 opposite to the light source unit 12 is the display surface of the liquid crystal display element 11.
　液晶層２２は、ＴＦＴ基板２０及びＣＦ基板２１間を貼り合わせるシール材２９によって封入された液晶材料により構成される。液晶材料は、ＴＦＴ基板２０及びＣＦ基板２１間に印加された電界に応じて液晶分子の配向が操作されて光学特性が変化する。液晶モードとしては、例えばＶＡ（Vertical Alignment）モードが用いられるが、勿論、ＴＮ（Twisted Nematic）モードやホモジニアスモードなど他の液晶モードであってもよい。 The liquid crystal layer 22 is composed of a liquid crystal material sealed by a sealing material 29 for bonding the TFT substrate 20 and the CF substrate 21 together. In the liquid crystal material, the alignment of the liquid crystal molecules is manipulated according to the electric field applied between the TFT substrate 20 and the CF substrate 21, and the optical characteristics change. As the liquid crystal mode, for example, a VA (Vertical Alignment) mode is used, but of course, other liquid crystal modes such as a TN (Twisted モ ー ド Nematic) mode and a homogeneous mode may be used.
　液晶層２２側のＴＦＴ基板２０上には、複数のスイッチングトランジスタ２３が設けられる。スイッチングトランジスタ２３としては、例えば薄膜トランジスタ（ＴＦＴ：Thin Film Transistor）が用いられる。スイッチングトランジスタ２３は、走査線（図示せず）に電気的に接続されるゲート電極と、ゲート電極上に設けられたゲート絶縁膜と、ゲート絶縁膜上に設けられた半導体層（例えばアモルファスシリコン層）と、半導体層上に離間して設けられたソース電極及びドレイン電極とを備える。ソース電極は、信号線（図示せず）に電気的に接続される。 A plurality of switching transistors 23 are provided on the TFT substrate 20 on the liquid crystal layer 22 side. As the switching transistor 23, for example, a thin film transistor (TFT: Thin Film Transistor) is used. The switching transistor 23 includes a gate electrode electrically connected to a scanning line (not shown), a gate insulating film provided on the gate electrode, and a semiconductor layer (for example, an amorphous silicon layer) provided on the gate insulating film. And a source electrode and a drain electrode provided on the semiconductor layer so as to be separated from each other. The source electrode is electrically connected to a signal line (not shown).
　スイッチングトランジスタ２３上には、絶縁層２４が設けられる。絶縁層２４上には、複数の画素電極２５が設けられる。絶縁層２４内かつスイッチングトランジスタ２３のドレイン電極上には、画素電極２５に電気的に接続されたコンタクトプラグ２６が設けられる。 An insulating layer 24 is provided on the switching transistor 23. A plurality of pixel electrodes 25 are provided on the insulating layer 24. A contact plug 26 electrically connected to the pixel electrode 25 is provided in the insulating layer 24 and on the drain electrode of the switching transistor 23.
　液晶層２２側のＣＦ基板２１上には、カラーフィルター２７が設けられる。カラーフィルター２７は、複数の着色フィルター（着色部材）を備え、具体的には、複数の赤フィルター２７－Ｒ、複数の緑フィルター２７－Ｇ、及び複数の青フィルター２７－Ｂを備える。一般的なカラーフィルターは光の三原色である赤（Ｒ）、緑（Ｇ）、青（Ｂ）で構成される。隣接したＲ、Ｇ、Ｂの三色のセットが表示の単位（ピクセル、又は画素と呼ぶ）となっており、１つの画素中のＲ、Ｇ、Ｂのいずれか単色の部分はサブピクセル（サブ画素）と呼ばれる最小駆動単位である。スイッチングトランジスタ２３及び画素電極２５は、サブピクセルごとに設けられる。 A color filter 27 is provided on the CF substrate 21 on the liquid crystal layer 22 side. The color filter 27 includes a plurality of coloring filters (coloring members), and specifically includes a plurality of red filters 27-R, a plurality of green filters 27-G, and a plurality of blue filters 27-B. A general color filter is composed of three primary colors of light, red (R), green (G), and blue (B). A set of three colors R, G, and B adjacent to each other is a display unit (referred to as a pixel or a pixel), and any single color portion of R, G, or B in one pixel is a subpixel (subpixel). This is a minimum drive unit called a pixel. The switching transistor 23 and the pixel electrode 25 are provided for each subpixel.
　赤フィルター２７－Ｒ、緑フィルター２７－Ｇ、及び青フィルター２７－Ｂの境界部分、及び画素（サブピクセル）の境界部分には、遮光用のブラックマトリクス（遮光膜）ＢＭが設けられる。すなわち、ブラックマトリクスＢＭは、網目状に形成される。ブラックマトリクスＢＭは、例えば、着色部材間の不要な光を遮蔽し、コントラストを向上させるために設けられる。 A black matrix (light-shielding film) BM for light shielding is provided at the boundary between the red filter 27-R, the green filter 27-G, and the blue filter 27-B and the boundary between the pixels (sub-pixels). That is, the black matrix BM is formed in a mesh shape. The black matrix BM is provided, for example, to shield unnecessary light between the coloring members and improve contrast.
　カラーフィルター２７及びブラックマトリクスＢＭ上には、共通電極２８が設けられる。共通電極２８は、液晶表示素子１１の表示領域全体に平面状に形成される。 A common electrode 28 is provided on the color filter 27 and the black matrix BM. The common electrode 28 is formed in a planar shape over the entire display area of the liquid crystal display element 11.
　偏光板３０、３１は、ＴＦＴ基板２０及びＣＦ基板２１を挟むように設けられる。偏光板３０、３１は、光の進行方向に直交する平面内において、互いに直交する透過軸及び吸収軸を有する。偏光板３０、３１は、ランダムな方向の振動面を有する光のうち、透過軸に平行な振動面を有する直線偏光（直線偏光した光成分）を透過し、吸収軸に平行な振動面を有する直線偏光（直線偏光した光成分）を吸収する。偏光板３０、３１は、互いの透過軸が直交するように、すなわち直交ニコル状態で配置される。 The polarizing plates 30 and 31 are provided so as to sandwich the TFT substrate 20 and the CF substrate 21. The polarizing plates 30 and 31 have a transmission axis and an absorption axis orthogonal to each other in a plane orthogonal to the light traveling direction. The polarizing plates 30 and 31 transmit linearly polarized light (linearly polarized light component) having a vibration surface parallel to the transmission axis out of light having vibration surfaces in random directions, and have a vibration surface parallel to the absorption axis. Absorbs linearly polarized light (linearly polarized light component). The polarizing plates 30 and 31 are arranged so that their transmission axes are orthogonal to each other, that is, in an orthogonal Nicol state.
　画素電極２５、コンタクトプラグ２６、及び共通電極２８は、透明電極から構成され、例えばＩＴＯ（インジウム錫酸化物）が用いられる。絶縁層２４としては、透明な絶縁材料が用いられ、例えば、シリコン窒化物（ＳｉＮ）が用いられる。 The pixel electrode 25, the contact plug 26, and the common electrode 28 are made of transparent electrodes, and for example, ITO (indium tin oxide) is used. As the insulating layer 24, a transparent insulating material is used, for example, silicon nitride (SiN).
　図２に戻り、液晶表示素子１１において、偏光板３０のＴＦＴ基板２０と反対面には、拡散部材３２が設けられる。拡散部材３２は、透過光をランダムな方向に拡散（散乱）することで、透過光を均一化する機能を有する。拡散部材３２は、拡散粘着材、拡散フィルム、又は拡散板などから構成される。拡散部材３２として拡散粘着材を用いた場合、拡散粘着材は、入射光を拡散する機能の他に、偏光板３０及び反射型偏光板３３を貼り付ける機能を有する。透過光の均一性を向上させるためには、拡散部材３２のヘイズ値（haze value）は、例えば、６０％以上かつ９５％以下の範囲に設定される。 2, in the liquid crystal display element 11, a diffusion member 32 is provided on the surface of the polarizing plate 30 opposite to the TFT substrate 20. The diffusing member 32 has a function of making the transmitted light uniform by diffusing (scattering) the transmitted light in a random direction. The diffusion member 32 is composed of a diffusion adhesive material, a diffusion film, a diffusion plate, or the like. When a diffusion adhesive material is used as the diffusion member 32, the diffusion adhesive material has a function of attaching the polarizing plate 30 and the reflective polarizing plate 33 in addition to the function of diffusing incident light. In order to improve the uniformity of the transmitted light, the haze value (haze value) of the diffusing member 32 is set, for example, in the range of 60% or more and 95% or less.
　拡散部材３２の偏光板３０と反対面には、反射型偏光板３３が設けられる。反射型偏光板３３は、光の進行方向に直交する平面内において、互いに直交する透過軸及び反射軸を有する。反射型偏光板３３は、ランダムな方向の振動面を有する光のうち、透過軸に平行な振動面を有する直線偏光（直線偏光した光成分）を透過し、反射軸に平行な振動面を有する直線偏光（直線偏光した光成分）を反射する。反射型偏光板３３の透過軸は、偏光板３０の透過軸と平行に設定される。反射型偏光板３３としては、例えば、３Ｍ社のＤＢＥＦ（Dual Brightness Enhancement Film）、又は旭化成のワイヤグリッド偏光板などがある。 A reflective polarizing plate 33 is provided on the surface of the diffusing member 32 opposite to the polarizing plate 30. The reflective polarizing plate 33 has a transmission axis and a reflection axis that are orthogonal to each other in a plane orthogonal to the traveling direction of light. The reflective polarizing plate 33 transmits linearly polarized light (linearly polarized light component) having a vibration surface parallel to the transmission axis out of light having a vibration surface in a random direction and has a vibration surface parallel to the reflection axis. Reflects linearly polarized light (linearly polarized light component). The transmission axis of the reflective polarizing plate 33 is set parallel to the transmission axis of the polarizing plate 30. Examples of the reflective polarizing plate 33 include DBM (Dual Brightness Enhancement Film) manufactured by 3M Company, Asahi Kasei Wire Grid Polarizer, and the like.
　反射型偏光板３３の拡散部材３２と反対面には、位相差板（λ／４板）３４が設けられる。位相差板３４は、屈折率異方性を有しており、光の進行方向に直交する平面内において、互いに直交する遅相軸及び進相軸を有する。位相差板３４は、遅相軸と進相軸とをそれぞれ透過する所定波長の光の間に所定のリタデーション（λを透過する光の波長としたとき、λ／４の位相差）を与える機能を有している。すなわち、位相差板３４は、λ／４板から構成される。位相差板３４の遅相軸は、反射型偏光板３３の透過軸に対して４５°の角度をなすように設定される。 A retardation plate (λ / 4 plate) 34 is provided on the surface of the reflective polarizing plate 33 opposite to the diffusion member 32. The phase difference plate 34 has refractive index anisotropy, and has a slow axis and a fast axis that are perpendicular to each other in a plane perpendicular to the traveling direction of light. The phase difference plate 34 has a function of giving a predetermined retardation (a phase difference of λ / 4 when λ is a wavelength of light transmitted) between light of a predetermined wavelength that transmits the slow axis and the fast axis. have. That is, the phase difference plate 34 is composed of a λ / 4 plate. The slow axis of the retardation plate 34 is set so as to form an angle of 45 ° with respect to the transmission axis of the reflective polarizing plate 33.
　なお、図２の偏光板、反射型偏光板、及び位相差板の平面図は、光源部１２側から見た平面を示している。また、図２の平面図において、水平方向に対する偏光板３０の透過軸の角度をθと表記している。角度θは、任意に設定可能である。 In addition, the plan view of the polarizing plate, the reflective polarizing plate, and the retardation plate in FIG. 2 shows a plane viewed from the light source unit 12 side. Further, in the plan view of FIG. 2, the angle of the transmission axis of the polarizing plate 30 with respect to the horizontal direction is denoted as θ. The angle θ can be arbitrarily set.
　次に、図２及び図４を用いて光源部１２の構成について説明する。図４は、液晶表示素子１１側から見た光源部１２の平面図である。 Next, the configuration of the light source unit 12 will be described with reference to FIGS. FIG. 4 is a plan view of the light source unit 12 viewed from the liquid crystal display element 11 side.
　光源部１２は、基板４０、複数の発光素子４１、反射膜（反射板）４２、及びケース４３を備える。基板４０上には、複数の発光素子４１が設けられる。各発光素子４１は、例えば白色のＬＥＤから構成される。図４では、４個の発光素子４１を一例として示しているが、発光素子４１の数は任意に設計でき、発光素子４１の数は１個であってもよいし、４個以外の複数個であってもよい。基板４０は、発光素子４１に電源を供給するための配線が設けられた回路基板から構成される。基板４０の表面は、液晶表示素子１１のＴＦＴ基板２０又はＣＦ基板２１の表面と平行に配置される。 The light source unit 12 includes a substrate 40, a plurality of light emitting elements 41, a reflective film (reflecting plate) 42, and a case 43. A plurality of light emitting elements 41 are provided on the substrate 40. Each light emitting element 41 is composed of, for example, a white LED. In FIG. 4, four light emitting elements 41 are shown as an example. However, the number of light emitting elements 41 can be arbitrarily designed, and the number of light emitting elements 41 may be one, or a plurality other than four. It may be. The substrate 40 is composed of a circuit board provided with wiring for supplying power to the light emitting element 41. The surface of the substrate 40 is disposed in parallel with the surface of the TFT substrate 20 or the CF substrate 21 of the liquid crystal display element 11.
　基板４０上の発光素子４１が設けられていない領域には、反射膜４２が設けられる。すなわち、反射膜４２は、複数の発光素子４１とそれぞれほぼ同じ平面形状を有する複数の開口部を有する。反射膜４２は、液晶表示素子１１側から入射する光を、再度、液晶表示素子１１側へ反射する。また、基板４０上には、複数の発光素子４１及び反射膜４２を囲むケース４３が設けられる。基板４０及びケース４３の外形は、例えば矩形である。 A reflective film 42 is provided in a region on the substrate 40 where the light emitting element 41 is not provided. That is, the reflective film 42 has a plurality of openings each having substantially the same planar shape as the plurality of light emitting elements 41. The reflective film 42 reflects light incident from the liquid crystal display element 11 side again to the liquid crystal display element 11 side. On the substrate 40, a case 43 surrounding the light emitting elements 41 and the reflective film 42 is provided. The external shapes of the substrate 40 and the case 43 are, for example, rectangular.
　［２．動作］
　次に、上記のように構成されたヘッドアップディスプレイ装置１００の動作について説明する。 [2. Operation]
Next, the operation of the head-up display device 100 configured as described above will be described.
　発光素子４１から出射された照明光は、位相差板３４を透過し、反射型偏光板３３に入射する。反射型偏光板３３は、透過軸と平行な光成分を透過し、反射軸と平行な光成分を反射する。反射型偏光板３３を透過した直線偏光は、拡散部材３２に入射する。 The illumination light emitted from the light emitting element 41 passes through the phase difference plate 34 and enters the reflective polarizing plate 33. The reflective polarizing plate 33 transmits a light component parallel to the transmission axis and reflects a light component parallel to the reflection axis. The linearly polarized light that has passed through the reflective polarizing plate 33 enters the diffusing member 32.
　一方、反射型偏光板３３によって反射された直線偏光は、位相差板３４を透過するとともに円偏光となる。続いて、位相差板３４を透過した円偏光は、主に反射膜４２で反射されて逆向きの円偏光となり、再度、位相差板３４を透過する。すなわち、反射型偏光板３３によって反射された直線偏光は、位相差板３４を２回透過するため、９０°旋光する。この結果、位相差板３４を２回透過した直線偏光は、反射型偏光板３３の透過軸と平行になるため、反射型偏光板３３を透過する。 On the other hand, the linearly polarized light reflected by the reflective polarizing plate 33 passes through the phase difference plate 34 and becomes circularly polarized light. Subsequently, the circularly polarized light transmitted through the phase difference plate 34 is reflected mainly by the reflective film 42 to become circularly polarized light in the reverse direction, and is transmitted through the phase difference plate 34 again. That is, the linearly polarized light reflected by the reflective polarizing plate 33 passes through the phase difference plate 34 twice, and thus rotates 90 °. As a result, the linearly polarized light that has passed through the retardation plate 34 twice is parallel to the transmission axis of the reflective polarizing plate 33, and thus passes through the reflective polarizing plate 33.
　これにより、発光素子４１から出射された照明光の大部分（ほぼ１００％）を、反射型偏光板３３を透過させることができる。反射型偏光板３３を透過した直線偏光は、拡散部材３２によって拡散され、均一性（面内均一性）が向上する。 Thereby, most (approximately 100%) of the illumination light emitted from the light emitting element 41 can be transmitted through the reflective polarizing plate 33. The linearly polarized light transmitted through the reflective polarizing plate 33 is diffused by the diffusing member 32 and the uniformity (in-plane uniformity) is improved.
　続いて、拡散部材３２を透過してある程度均一になった光が偏光板３０に入射し、偏光板３０は、透過軸と平行な直線偏光を透過する。続いて、偏光板３０を透過した直線偏光は、液晶層２２に入射する。 Subsequently, light that has passed through the diffusing member 32 and becomes uniform to some extent is incident on the polarizing plate 30, and the polarizing plate 30 transmits linearly polarized light parallel to the transmission axis. Subsequently, the linearly polarized light transmitted through the polarizing plate 30 enters the liquid crystal layer 22.
　このように、本来、偏光板３０で吸収されるはずの光を、表示として再利用することができる。これにより、液晶表示素子１１を透過する光の強度を大きくすることができ、また、発光素子４１からの照明光の大部分を表示して利用することができる。その後、液晶表示素子１１を透過した表示光は、表示部材１４を介して運転者１５に虚像１６として視認される。 Thus, the light that should originally be absorbed by the polarizing plate 30 can be reused as a display. Thereby, the intensity | strength of the light which permeate | transmits the liquid crystal display element 11 can be enlarged, and most illumination light from the light emitting element 41 can be displayed and utilized. Thereafter, the display light transmitted through the liquid crystal display element 11 is visually recognized as a virtual image 16 by the driver 15 through the display member 14.
　［３．変形例］
　図５は、第１実施形態の変形例に係る液晶表示素子１１及び光源部１２の断面図である。変形例では、拡散部材３２、反射型偏光板３３、及び位相差板３４からなる積層構造は、光源部１２に設けられる。 [3. Modified example]
FIG. 5 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to a modification of the first embodiment. In the modified example, a laminated structure including the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 is provided in the light source unit 12.
　発光素子４１の上方かつケース４３上には、位相差板３４、反射型偏光板３３、及び拡散部材３２が順に積層される。すなわち、拡散部材３２、反射型偏光板３３、及び位相差板３４は、光源部１２に組み込まれる。拡散部材３２、反射型偏光板３３、及び位相差板３４のサイズは、例えばケース４３のサイズと同じである。 The phase difference plate 34, the reflective polarizing plate 33, and the diffusing member 32 are sequentially stacked above the light emitting element 41 and on the case 43. That is, the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 are incorporated in the light source unit 12. The sizes of the diffusing member 32, the reflective polarizing plate 33, and the retardation film 34 are the same as the size of the case 43, for example.
　その他の構成は、前述した第１実施形態と同じである。変形例においても、発光素子４１から出射された照明光の光路及び偏光状態は、前述した第１実施形態の場合と同じである。 Other configurations are the same as those of the first embodiment described above. Also in the modification, the optical path and the polarization state of the illumination light emitted from the light emitting element 41 are the same as those in the first embodiment described above.
　［４．効果］
　以上詳述したように第１実施形態では、液晶表示素子１１と光源部１２との間に、液晶表示素子１１から順に、拡散部材３２、反射型偏光板３３、及び位相差板３４が積層された積層構造を挿入する。そして、光源部１２には、反射型偏光板３３によって反射された光を、再度、液晶表示素子１１側に反射する反射膜４２を設けるようにしている。 [4. effect]
As described above in detail, in the first embodiment, the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 are laminated in order from the liquid crystal display element 11 between the liquid crystal display element 11 and the light source unit 12. Insert the laminated structure. The light source unit 12 is provided with a reflective film 42 that reflects the light reflected by the reflective polarizing plate 33 to the liquid crystal display element 11 side again.
　従って第１実施形態によれば、光源部１２から出射された照明光の大部分を液晶層２２に入射させることができる。これにより、液晶表示素子１１の輝度を向上させることができる。 Therefore, according to the first embodiment, most of the illumination light emitted from the light source unit 12 can be incident on the liquid crystal layer 22. Thereby, the brightness | luminance of the liquid crystal display element 11 can be improved.
　また、光源部１２の光強度を下げた場合でも、液晶表示素子１１の表示特性が劣化するのを抑えることができる。これにより、ヘッドアップディスプレイ装置１００の消費電力を低減することができる。 Further, even when the light intensity of the light source unit 12 is lowered, it is possible to suppress the deterioration of the display characteristics of the liquid crystal display element 11. Thereby, the power consumption of the head-up display device 100 can be reduced.
　また、偏光板３０と反射型偏光板３３との間に、光を均一化するための拡散部材３２を設けている。これにより、均一性が向上した光を液晶層２２に入射させることができるため、液晶表示素子１１の表示特性を向上させることができる。 Further, a diffusing member 32 for making the light uniform is provided between the polarizing plate 30 and the reflective polarizing plate 33. Thereby, light with improved uniformity can be incident on the liquid crystal layer 22, so that the display characteristics of the liquid crystal display element 11 can be improved.
　図６は、比較例１に係る液晶表示素子１１及び光源部１２の断面図である。比較例１では、発光素子４１から出射された照明光の面内均一性を向上させるために、光源部１２が拡散部材３２を備え、この拡散部材３２は、発光素子４１の上方かつケース４３上に設けられる。比較例１の拡散部材３２のヘイズ値は、例えば９３％である。また、液晶表示素子１１は、偏光板３０のＴＦＴ基板２０と反対面に設けられた反射型偏光板３３を備える。 FIG. 6 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to Comparative Example 1. In Comparative Example 1, in order to improve the in-plane uniformity of illumination light emitted from the light emitting element 41, the light source unit 12 includes a diffusing member 32, which is above the light emitting element 41 and on the case 43. Is provided. The haze value of the diffusion member 32 of Comparative Example 1 is, for example, 93%. The liquid crystal display element 11 includes a reflective polarizing plate 33 provided on the surface of the polarizing plate 30 opposite to the TFT substrate 20.
　比較例１では、発光素子４１から出射された照明光は、拡散部材３２によって均一化された後に反射型偏光板３３に入射する。そして、反射型偏光板３３を透過した直線偏光（反射型偏光板３３の透過軸に平行な直線偏光）は、偏光板３０を透過して液晶層２２に入射する。 In Comparative Example 1, the illumination light emitted from the light emitting element 41 is made uniform by the diffusing member 32 and then enters the reflective polarizing plate 33. Then, the linearly polarized light transmitted through the reflective polarizing plate 33 (linearly polarized light parallel to the transmission axis of the reflective polarizing plate 33) passes through the polarizing plate 30 and enters the liquid crystal layer 22.
　一方、反射型偏光板３３によって反射された直線偏光（反射型偏光板３３の反射軸に平行な直線偏光）は、拡散部材３２によって拡散される。拡散部材３２によって拡散された光の一部は、液晶表示素子１１側に反射され、反射型偏光板３３を透過する。このように、光源部１２に拡散部材３２を設けることで、液晶表示素子１１の輝度を向上させるようにしている。 On the other hand, the linearly polarized light reflected by the reflective polarizing plate 33 (linearly polarized light parallel to the reflection axis of the reflective polarizing plate 33) is diffused by the diffusing member 32. A part of the light diffused by the diffusing member 32 is reflected toward the liquid crystal display element 11 and passes through the reflective polarizing plate 33. Thus, the luminance of the liquid crystal display element 11 is improved by providing the light source unit 12 with the diffusing member 32.
　図７は、比較例２に係る液晶表示素子１１及び光源部１２の断面図である。光源部１２は、基板４０上に設けられた反射膜４２を備える。その他の構成は、図６の比較例１と同じである。 FIG. 7 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to Comparative Example 2. The light source unit 12 includes a reflective film 42 provided on the substrate 40. Other configurations are the same as those of Comparative Example 1 in FIG.
　比較例２では、反射型偏光板３３によって反射された直線偏光は、光源部１２の反射膜４２で反射され、この反射光は、拡散部材３２によって拡散される。続いて、拡散部材３２を透過した光の一部は、反射型偏光板３３を透過する。このように、光源部１２に反射膜４２及び拡散部材３２を設けることで、液晶表示素子１１の輝度を向上させるようにしている。 In Comparative Example 2, the linearly polarized light reflected by the reflective polarizing plate 33 is reflected by the reflective film 42 of the light source unit 12, and the reflected light is diffused by the diffusing member 32. Subsequently, part of the light transmitted through the diffusing member 32 passes through the reflective polarizing plate 33. Thus, the luminance of the liquid crystal display element 11 is improved by providing the light source unit 12 with the reflective film 42 and the diffusing member 32.
　図８は、比較例１（図６）、比較例２（図７）、及び実施例（図２の第１実施形態）における白輝度を説明する図である。なお、図８の白輝度は、液晶表示素子１１の表示光による数値である。比較例１の白輝度を１００とすると、比較例２の白輝度が１０９であり、光源部１２に反射膜４２を設けることで、白輝度が多少向上している。さらに、実施例（図２の第１実施形態）の構成を用いることで、比較例１と比べて、白輝度を７０％向上させることができる。 FIG. 8 is a diagram for explaining white luminance in Comparative Example 1 (FIG. 6), Comparative Example 2 (FIG. 7), and Example (first embodiment of FIG. 2). Note that the white luminance in FIG. 8 is a numerical value by the display light of the liquid crystal display element 11. Assuming that the white luminance in Comparative Example 1 is 100, the white luminance in Comparative Example 2 is 109, and the white luminance is somewhat improved by providing the light source unit 12 with the reflective film 42. Furthermore, by using the configuration of the example (first embodiment of FIG. 2), white luminance can be improved by 70% compared to the comparative example 1.
　［第２実施形態］
　第２実施形態は、位相差板（λ／４板）３４が除かれ、拡散部材３２、反射型偏光板３３、及び反射膜４２を用いて液晶表示素子１１の輝度を向上させるようにしている。 [Second Embodiment]
In the second embodiment, the retardation plate (λ / 4 plate) 34 is removed, and the luminance of the liquid crystal display element 11 is improved by using the diffusing member 32, the reflective polarizing plate 33, and the reflective film 42. .
　図９は、本発明の第２実施形態に係る液晶表示素子１１及び光源部１２の断面図である。第２実施形態の液晶表示素子１１は、第１実施形態の図２と比べて、位相差板（λ／４板）３４が除かれている。図９のその他の構成は、図２と同じである。 FIG. 9 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to the second embodiment of the present invention. In the liquid crystal display element 11 of the second embodiment, the phase difference plate (λ / 4 plate) 34 is removed as compared with FIG. 2 of the first embodiment. Other configurations in FIG. 9 are the same as those in FIG.
　発光素子４１から出射された照明光は、反射型偏光板３３に入射する。反射型偏光板３３を透過した直線偏光は、拡散部材３２に入射し、一方、反射型偏光板３３によって反射された直線偏光は、主に光源部１２の反射膜４２によって反射される。反射膜４２によって反射された反射光には、偏光状態が乱された光成分が含まれ、なおかつ反射型偏光板３３の透過軸に平行な光成分も生成される。この光成分は、反射型偏光板３３を透過する。反射型偏光板３３を透過した直線偏光は、拡散部材３２によって拡散され、均一性が向上する。 The illumination light emitted from the light emitting element 41 enters the reflective polarizing plate 33. The linearly polarized light transmitted through the reflective polarizing plate 33 enters the diffusing member 32, while the linearly polarized light reflected by the reflective polarizing plate 33 is mainly reflected by the reflective film 42 of the light source unit 12. The reflected light reflected by the reflective film 42 includes a light component whose polarization state is disturbed, and a light component parallel to the transmission axis of the reflective polarizing plate 33 is also generated. This light component is transmitted through the reflective polarizing plate 33. The linearly polarized light transmitted through the reflective polarizing plate 33 is diffused by the diffusing member 32 and the uniformity is improved.
　以上詳述したように第２実施形態では、液晶表示素子１１に反射型偏光板３３及び拡散部材３２を設け、また、光源部１２に反射膜４２を設けるようにしている。これにより、液晶表示素子１１の輝度を向上させることができる。また、第２実施形態の構成は、第１実施形態に比べて部材の数が削減できるため、製造コストを低減することができる。 As described in detail above, in the second embodiment, the liquid crystal display element 11 is provided with the reflective polarizing plate 33 and the diffusing member 32, and the light source unit 12 is provided with the reflective film 42. Thereby, the brightness | luminance of the liquid crystal display element 11 can be improved. Moreover, since the number of members can be reduced compared with the first embodiment, the configuration of the second embodiment can reduce the manufacturing cost.
　（変形例）
　図１０は、第２実施形態の変形例に係る液晶表示素子１１及び光源部１２の断面図である。変形例では、拡散部材３２、及び反射型偏光板３３からなる積層構造は、光源部１２に設けられる。 (Modification)
FIG. 10 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to a modification of the second embodiment. In the modified example, the laminated structure including the diffusion member 32 and the reflective polarizing plate 33 is provided in the light source unit 12.
　発光素子４１の上方かつケース４３上には、反射型偏光板３３、及び拡散部材３２が順に積層される。すなわち、拡散部材３２、及び反射型偏光板３３は、光源部１２に組み込まれる。その他の構成は、前述した第２実施形態と同じである。変形例においても、発光素子４１から出射された照明光の光路及び偏光状態は、前述した第２実施形態の場合と同じである。 The reflective polarizing plate 33 and the diffusing member 32 are sequentially laminated above the light emitting element 41 and on the case 43. That is, the diffusing member 32 and the reflective polarizing plate 33 are incorporated in the light source unit 12. Other configurations are the same as those of the second embodiment described above. Also in the modification, the optical path and the polarization state of the illumination light emitted from the light emitting element 41 are the same as those in the second embodiment described above.
　［第３実施形態］
　第３実施形態は、光源部１２に設けられていた反射膜４２が除かれ、拡散部材３２、反射型偏光板３３、及び位相差板（λ／４板）３４を用いて液晶表示素子１１の輝度を向上させるようにしている。 [Third Embodiment]
In the third embodiment, the reflection film 42 provided on the light source unit 12 is removed, and the liquid crystal display element 11 is formed by using the diffusion member 32, the reflective polarizing plate 33, and the retardation plate (λ / 4 plate) 34. The brightness is improved.
　図１１は、本発明の第３実施形態に係る液晶表示素子１１及び光源部１２の断面図である。第３実施形態の液晶表示素子１１は、第１実施形態の図２に示した液晶表示素子１１と同じ構成である。第３実施形態の光源部１２は、第１実施形態の図２と比べて、反射膜４２が除かれている。 FIG. 11 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to the third embodiment of the present invention. The liquid crystal display element 11 of the third embodiment has the same configuration as the liquid crystal display element 11 shown in FIG. 2 of the first embodiment. In the light source unit 12 of the third embodiment, the reflective film 42 is removed as compared with FIG. 2 of the first embodiment.
　光源部１２の基板４０は、光反射性を有する平面を有し、すなわち、光を反射する反射面を有する。基板４０は、その反射面が液晶表示素子１１に対向するように配置される。基板４０は、例えば、ガラスエポキシ基板から構成される。反射膜４２に比べて基板４０の反射率は低くなるが、基板４０は、位相差板３４側からの光を反射する。 The substrate 40 of the light source unit 12 has a flat surface having light reflectivity, that is, a reflective surface that reflects light. The substrate 40 is disposed so that the reflection surface thereof faces the liquid crystal display element 11. The board | substrate 40 is comprised from a glass epoxy board | substrate, for example. Although the reflectance of the substrate 40 is lower than that of the reflective film 42, the substrate 40 reflects light from the phase difference plate 34 side.
　反射型偏光板３３によって反射された直線偏光は、位相差板３４を透過するとともに円偏光となる。続いて、位相差板３４を透過した円偏光は、主に基板４０で反射されて逆向きの円偏光となり、再度、位相差板３４を透過する。この結果、位相差板３４を２回透過した直線偏光は、反射型偏光板３３の透過軸と平行になるため、反射型偏光板３３を透過する。反射型偏光板３３を透過した直線偏光は、拡散部材３２によって拡散され、均一性が向上する。 The linearly polarized light reflected by the reflective polarizing plate 33 passes through the phase difference plate 34 and becomes circularly polarized light. Subsequently, the circularly polarized light transmitted through the phase difference plate 34 is mainly reflected by the substrate 40 to become circularly polarized light in the reverse direction, and is transmitted through the phase difference plate 34 again. As a result, the linearly polarized light that has passed through the retardation plate 34 twice is parallel to the transmission axis of the reflective polarizing plate 33, and thus passes through the reflective polarizing plate 33. The linearly polarized light transmitted through the reflective polarizing plate 33 is diffused by the diffusing member 32 and the uniformity is improved.
　以上詳述したように第３実施形態では、反射型偏光板３３によって反射された反射光を光源部１２の基板４０によって反射させるようにしている。これにより、液晶表示素子１１の輝度を向上させることができる。また、第３実施形態の構成は、第１実施形態に比べて部材の数が削減できるため、製造コストを低減することができる。 As described in detail above, in the third embodiment, the reflected light reflected by the reflective polarizing plate 33 is reflected by the substrate 40 of the light source unit 12. Thereby, the brightness | luminance of the liquid crystal display element 11 can be improved. Moreover, since the number of members can be reduced compared with the first embodiment, the configuration of the third embodiment can reduce the manufacturing cost.
　（変形例）
　図１２は、第３実施形態の変形例に係る液晶表示素子１１及び光源部１２の断面図である。変形例では、拡散部材３２、反射型偏光板３３、及び位相差板３４からなる積層構造は、光源部１２に設けられる。 (Modification)
FIG. 12 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to a modification of the third embodiment. In the modified example, a laminated structure including the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 is provided in the light source unit 12.
　発光素子４１の上方かつケース４３上には、位相差板３４、反射型偏光板３３、及び拡散部材３２が順に積層される。すなわち、拡散部材３２、反射型偏光板３３、及び位相差板３４は、光源部１２に組み込まれる。その他の構成は、前述した第３実施形態と同じである。変形例においても、発光素子４１から出射された照明光の光路及び偏光状態は、前述した第３実施形態の場合と同じである。 The phase difference plate 34, the reflective polarizing plate 33, and the diffusing member 32 are sequentially stacked above the light emitting element 41 and on the case 43. That is, the diffusing member 32, the reflective polarizing plate 33, and the retardation plate 34 are incorporated in the light source unit 12. Other configurations are the same as those of the third embodiment described above. Also in the modification, the optical path and the polarization state of the illumination light emitted from the light emitting element 41 are the same as those in the third embodiment described above.
　［第４実施形態］
　第４実施形態は、位相差板（λ／４板）３４と、光源部１２に設けられていた反射膜４２とが除かれ、拡散部材３２、及び反射型偏光板３３を用いて液晶表示素子１１の輝度を向上させるようにしている。 [Fourth Embodiment]
In the fourth embodiment, the phase difference plate (λ / 4 plate) 34 and the reflection film 42 provided in the light source unit 12 are removed, and a liquid crystal display element using a diffusion member 32 and a reflection type polarizing plate 33 is used. 11 brightness is improved.
　図１３は、本発明の第４実施形態に係る液晶表示素子１１及び光源部１２の断面図である。第４実施形態の液晶表示素子１１は、第２実施形態の図９に示した液晶表示素子１１と同じ構成である。第４実施形態の光源部１２は、第２実施形態の図９と比べて、反射膜４２が除かれている。 FIG. 13 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to the fourth embodiment of the present invention. The liquid crystal display element 11 of the fourth embodiment has the same configuration as the liquid crystal display element 11 shown in FIG. 9 of the second embodiment. In the light source unit 12 of the fourth embodiment, the reflective film 42 is removed as compared with FIG. 9 of the second embodiment.
　光源部１２の基板４０は、例えば、ガラスエポキシ基板から構成される。反射膜４２に比べて基板４０の反射率は低くなるが、基板４０は、反射型偏光板３３によって反射された直線偏光を反射する。基板４０によって反射された反射光には、偏光状態が乱された光成分が生成され、なおかつ反射型偏光板３３の透過軸に平行な光成分も生成される。この光成分は、反射型偏光板３３を透過する。反射型偏光板３３を透過した直線偏光は、拡散部材３２によって拡散され、均一性が向上する。 The substrate 40 of the light source unit 12 is composed of, for example, a glass epoxy substrate. Although the reflectance of the substrate 40 is lower than that of the reflective film 42, the substrate 40 reflects the linearly polarized light reflected by the reflective polarizing plate 33. In the reflected light reflected by the substrate 40, a light component whose polarization state is disturbed is generated, and a light component parallel to the transmission axis of the reflective polarizing plate 33 is also generated. This light component is transmitted through the reflective polarizing plate 33. The linearly polarized light transmitted through the reflective polarizing plate 33 is diffused by the diffusing member 32 and the uniformity is improved.
　以上詳述したように第４実施形態では、液晶表示素子１１に反射型偏光板３３及び拡散部材３２を設け、反射型偏光板３３によって反射された直線偏光を光源部１２の基板４０によって反射させるようにしている。これにより、液晶表示素子１１の輝度を向上させることができる。また、第４実施形態の構成は、第２実施形態に比べて部材の数が削減できるため、製造コストを低減することができる。 As described in detail above, in the fourth embodiment, the liquid crystal display element 11 is provided with the reflective polarizing plate 33 and the diffusing member 32, and the linearly polarized light reflected by the reflective polarizing plate 33 is reflected by the substrate 40 of the light source unit 12. I am doing so. Thereby, the brightness | luminance of the liquid crystal display element 11 can be improved. Moreover, since the number of members can be reduced compared with 2nd Embodiment, the structure of 4th Embodiment can reduce manufacturing cost.
　（変形例）
　図１４は、第４実施形態の変形例に係る液晶表示素子１１及び光源部１２の断面図である。変形例では、拡散部材３２、及び反射型偏光板３３からなる積層構造は、光源部１２に設けられる。 (Modification)
FIG. 14 is a cross-sectional view of the liquid crystal display element 11 and the light source unit 12 according to a modification of the fourth embodiment. In the modified example, the laminated structure including the diffusion member 32 and the reflective polarizing plate 33 is provided in the light source unit 12.
　発光素子４１の上方かつケース４３上には、反射型偏光板３３、及び拡散部材３２が順に積層される。すなわち、拡散部材３２、及び反射型偏光板３３は、光源部１２に組み込まれる。その他の構成は、前述した第４実施形態と同じである。変形例においても、発光素子４１から出射された照明光の光路及び偏光状態は、前述した第４実施形態の場合と同じである。 The reflective polarizing plate 33 and the diffusing member 32 are sequentially laminated above the light emitting element 41 and on the case 43. That is, the diffusing member 32 and the reflective polarizing plate 33 are incorporated in the light source unit 12. Other configurations are the same as those of the fourth embodiment described above. Also in the modification, the optical path and the polarization state of the illumination light emitted from the light emitting element 41 are the same as those in the fourth embodiment described above.
　本発明は、上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲内で、構成要素を変形して具体化することが可能である。さらに、上記実施形態には種々の段階の発明が含まれており、１つの実施形態に開示される複数の構成要素の適宜な組み合わせ、若しくは異なる実施形態に開示される構成要素の適宜な組み合わせにより種々の発明を構成することができる。例えば、実施形態に開示される全構成要素から幾つかの構成要素が削除されても、発明が解決しようとする課題が解決でき、発明の効果が得られる場合には、これらの構成要素が削除された実施形態が発明として抽出されうる。 The present invention is not limited to the embodiment described above, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Further, the above embodiments include inventions at various stages, and are obtained by appropriately combining a plurality of constituent elements disclosed in one embodiment or by appropriately combining constituent elements disclosed in different embodiments. Various inventions can be configured. For example, even if some constituent elements are deleted from all the constituent elements disclosed in the embodiments, the problems to be solved by the invention can be solved and the effects of the invention can be obtained. Embodiments made can be extracted as inventions.
　１００…ヘッドアップディスプレイ装置、１０…液晶表示装置、１１…液晶表示素子、１２…光源部、１３…反射鏡、１４…表示部材、１５…運転者、１６…虚像、２０…ＴＦＴ基板、２１…ＣＦ基板、２２…液晶層、２３…スイッチングトランジスタ、２４…絶縁層、２５…画素電極、２６…コンタクトプラグ、２７…カラーフィルター、２８…共通電極、２９…シール材、３０，３１…偏光板、３２…拡散部材、３３…反射型偏光板、３４…位相差板、４０…基板、４１…発光素子、４２…反射膜、４３…ケース。 DESCRIPTION OF SYMBOLS 100 ... Head-up display apparatus, 10 ... Liquid crystal display device, 11 ... Liquid crystal display element, 12 ... Light source part, 13 ... Reflector, 14 ... Display member, 15 ... Driver | operator, 16 ... Virtual image, 20 ... TFT substrate, 21 ... CF substrate, 22 ... liquid crystal layer, 23 ... switching transistor, 24 ... insulating layer, 25 ... pixel electrode, 26 ... contact plug, 27 ... color filter, 28 ... common electrode, 29 ... sealing material, 30, 31 ... polarizing plate, 32 ... Diffusing member, 33 ... Reflective polarizing plate, 34 ... Retardation plate, 40 ... Substrate, 41 ... Light emitting element, 42 ... Reflecting film, 43 ... Case.

Claims (18)

  1. 　基板上に設けられた反射膜と、発光素子とを有する光源部と、
    　前記光源部側に設けられた第１偏光板と、前記第１偏光板と液晶層を介して対向配置された第２偏光板とを有する液晶表示素子と、
    　前記反射膜と前記第１偏光板との間に設けられ、光にλ／４の位相差を与える位相差板と、
    　前記位相差板と前記第１偏光板との間に設けられ、反射軸と平行な光成分を反射する反射型偏光板と、
    　前記反射型偏光板と前記第１偏光板との間に設けられ、光を拡散する拡散部材と、
    　を具備することを特徴とするヘッドアップディスプレイ装置用液晶表示装置。     A light source unit having a reflective film provided on the substrate and a light emitting element;
    A liquid crystal display element having a first polarizing plate provided on the light source unit side, and a second polarizing plate disposed opposite to the first polarizing plate via a liquid crystal layer;
    A retardation plate that is provided between the reflective film and the first polarizing plate and gives a phase difference of λ / 4 to light;
    A reflective polarizing plate provided between the retardation plate and the first polarizing plate and reflecting a light component parallel to a reflection axis;
    A diffusing member that is provided between the reflective polarizing plate and the first polarizing plate and diffuses light;
    A liquid crystal display device for a head-up display device.
  2. 　前記位相差板、前記反射型偏光板、及び前記拡散部材からなる積層構造は、前記液晶表示素子に接するように設けられることを特徴とする請求項１に記載のヘッドアップディスプレイ装置用液晶表示装置。 2. The liquid crystal display device for a head-up display device according to claim 1, wherein a laminated structure including the retardation plate, the reflective polarizing plate, and the diffusion member is provided in contact with the liquid crystal display element. .
  3. 　前記位相差板、前記反射型偏光板、及び前記拡散部材からなる積層構造は、前記光源部に接するように設けられることを特徴とする請求項１に記載のヘッドアップディスプレイ装置用液晶表示装置。 The liquid crystal display device for a head-up display device according to claim 1, wherein a laminated structure including the retardation plate, the reflective polarizing plate, and the diffusing member is provided so as to be in contact with the light source unit.
  4. 　前記反射型偏光板の透過軸は、前記第１偏光板の透過軸と平行であることを特徴とする請求項１に記載のヘッドアップディスプレイ装置用液晶表示装置。 The liquid crystal display device for a head-up display device according to claim 1, wherein a transmission axis of the reflective polarizing plate is parallel to a transmission axis of the first polarizing plate.
  5. 　前記位相差板の遅相軸は、前記反射型偏光板の透過軸と４５°の角度をなすことを特徴とする請求項１に記載のヘッドアップディスプレイ装置用液晶表示装置。 2. The liquid crystal display device for a head-up display device according to claim 1, wherein a slow axis of the retardation plate forms an angle of 45 ° with a transmission axis of the reflective polarizing plate.
  6. 　前記拡散部材は、拡散粘着材、拡散フィルム、又は拡散板からなり、
    　前記拡散部材のヘイズ値は、６０％以上かつ９５％以下であることを特徴とする請求項１に記載のヘッドアップディスプレイ装置用液晶表示装置。     The diffusion member is composed of a diffusion adhesive material, a diffusion film, or a diffusion plate,
    2. The liquid crystal display device for a head-up display device according to claim 1, wherein a haze value of the diffusion member is 60% or more and 95% or less.
  7. 　基板上に設けられた発光素子を有する光源部と、
    　前記光源部側に設けられた第１偏光板と、前記第１偏光板と液晶層を介して対向配置された第２偏光板とを有する液晶表示素子と、
    　前記光源部と前記第１偏光板との間に設けられ、光にλ／４の位相差を与える位相差板と、
    　前記位相差板と前記第１偏光板との間に設けられ、反射軸と平行な光成分を反射する反射型偏光板と、
    　前記反射型偏光板と前記第１偏光板との間に設けられ、光を拡散する拡散部材と、
    　を具備することを特徴とするヘッドアップディスプレイ装置用液晶表示装置。     A light source unit having a light emitting element provided on a substrate;
    A liquid crystal display element having a first polarizing plate provided on the light source unit side, and a second polarizing plate disposed opposite to the first polarizing plate via a liquid crystal layer;
    A retardation plate that is provided between the light source unit and the first polarizing plate and gives a phase difference of λ / 4 to light;
    A reflective polarizing plate provided between the retardation plate and the first polarizing plate and reflecting a light component parallel to a reflection axis;
    A diffusing member that is provided between the reflective polarizing plate and the first polarizing plate and diffuses light;
    A liquid crystal display device for a head-up display device.
  8. 　前記位相差板、前記反射型偏光板、及び前記拡散部材からなる積層構造は、前記液晶表示素子に接するように設けられることを特徴とする請求項７に記載のヘッドアップディスプレイ装置用液晶表示装置。 The liquid crystal display device for a head-up display device according to claim 7, wherein a laminated structure including the retardation plate, the reflective polarizing plate, and the diffusing member is provided so as to be in contact with the liquid crystal display element. .
  9. 　前記位相差板、前記反射型偏光板、及び前記拡散部材からなる積層構造は、前記光源部に接するように設けられることを特徴とする請求項７に記載のヘッドアップディスプレイ装置用液晶表示装置。 The liquid crystal display device for a head-up display device according to claim 7, wherein a laminated structure including the retardation plate, the reflective polarizing plate, and the diffusing member is provided so as to be in contact with the light source unit.
  10. 　前記反射型偏光板の透過軸は、前記第１偏光板の透過軸と平行であることを特徴とする請求項７に記載のヘッドアップディスプレイ装置用液晶表示装置。 The liquid crystal display device for a head-up display device according to claim 7, wherein a transmission axis of the reflective polarizing plate is parallel to a transmission axis of the first polarizing plate.
  11. 　前記位相差板の遅相軸は、前記反射型偏光板の透過軸と４５°の角度をなすことを特徴とする請求項７に記載のヘッドアップディスプレイ装置用液晶表示装置。 The liquid crystal display device for a head-up display device according to claim 7, wherein a slow axis of the retardation plate forms an angle of 45 ° with a transmission axis of the reflective polarizing plate.
  12. 　前記拡散部材は、拡散粘着材、拡散フィルム、又は拡散板からなり、
    　前記拡散部材のヘイズ値は、６０％以上かつ９５％以下であることを特徴とする請求項７に記載のヘッドアップディスプレイ装置用液晶表示装置。     The diffusion member is composed of a diffusion adhesive material, a diffusion film, or a diffusion plate,
    8. The liquid crystal display device for a head-up display device according to claim 7, wherein the diffusing member has a haze value of 60% or more and 95% or less.
  13. 　基板上に設けられた反射膜と、発光素子とを有する光源部と、
    　前記光源部側に設けられた第１偏光板と、前記第１偏光板と液晶層を介して対向配置された第２偏光板とを有する液晶表示素子と、
    　前記反射膜と前記第１偏光板との間に設けられ、反射軸と平行な光成分を反射する反射型偏光板と、
    　前記反射型偏光板と前記第１偏光板との間に設けられ、光を拡散する拡散部材と、
    　を具備することを特徴とするヘッドアップディスプレイ装置用液晶表示装置。     A light source unit having a reflective film provided on the substrate and a light emitting element;
    A liquid crystal display element having a first polarizing plate provided on the light source unit side, and a second polarizing plate disposed opposite to the first polarizing plate via a liquid crystal layer;
    A reflective polarizing plate provided between the reflective film and the first polarizing plate and reflecting a light component parallel to a reflection axis;
    A diffusing member that is provided between the reflective polarizing plate and the first polarizing plate and diffuses light;
    A liquid crystal display device for a head-up display device.
  14. 　前記反射型偏光板、及び前記拡散部材からなる積層構造は、前記液晶表示素子に接するように設けられることを特徴とする請求項１３に記載のヘッドアップディスプレイ装置用液晶表示装置。 14. The liquid crystal display device for a head-up display device according to claim 13, wherein the laminated structure including the reflective polarizing plate and the diffusing member is provided in contact with the liquid crystal display element.
  15. 　前記反射型偏光板、及び前記拡散部材からなる積層構造は、前記光源部に接するように設けられることを特徴とする請求項１３に記載のヘッドアップディスプレイ装置用液晶表示装置。 14. The liquid crystal display device for a head-up display device according to claim 13, wherein the laminated structure including the reflective polarizing plate and the diffusing member is provided in contact with the light source unit.
  16. 　前記反射型偏光板の透過軸は、前記第１偏光板の透過軸と平行であることを特徴とする請求項１３に記載のヘッドアップディスプレイ装置用液晶表示装置。 14. The liquid crystal display device for a head-up display device according to claim 13, wherein a transmission axis of the reflective polarizing plate is parallel to a transmission axis of the first polarizing plate.
  17. 　前記拡散部材は、拡散粘着材、拡散フィルム、又は拡散板からなり、
    　前記拡散部材のヘイズ値は、６０％以上かつ９５％以下であることを特徴とする請求項１３に記載のヘッドアップディスプレイ装置用液晶表示装置。     The diffusion member is composed of a diffusion adhesive material, a diffusion film, or a diffusion plate,
    The liquid crystal display device for a head-up display device according to claim 13, wherein the diffusing member has a haze value of 60% or more and 95% or less.
  18. 　前記請求項１に記載の液晶表示装置と、
    　前記液晶表示装置により光変調された表示光を反射する反射部材と、
    　前記反射部材によって反射された反射光が投射される表示部材と、
    　を具備することを特徴とするヘッドアップディスプレイ装置。     A liquid crystal display device according to claim 1;
    A reflective member that reflects display light that is light-modulated by the liquid crystal display device;
    A display member on which the reflected light reflected by the reflecting member is projected;
    A head-up display device comprising:
PCT/JP2014/064994 2013-12-18 2014-06-05 Liquid-crystal display for heads-up display, and heads-up display WO2015093077A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020167016318A KR20160088397A (en) 2013-12-18 2014-06-05 Liquid-crystal display for heads-up display, and heads-up display
CN201480069218.0A CN105829947B (en) 2013-12-18 2014-06-05 Head-up display device liquid crystal display device and head-up display device
EP14871610.3A EP3086169B1 (en) 2013-12-18 2014-06-05 Head-up display
US15/184,234 US10067343B2 (en) 2013-12-18 2016-06-16 Liquid crystal display device for head-up display device, and head-up display device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-261640 2013-12-18
JP2013261640A JP2015118272A (en) 2013-12-18 2013-12-18 Liquid crystal display device for head-up display device, and head-up display device

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/184,234 Continuation US10067343B2 (en) 2013-12-18 2016-06-16 Liquid crystal display device for head-up display device, and head-up display device

Publications (1)

Publication Number Publication Date
WO2015093077A1 true WO2015093077A1 (en) 2015-06-25

Family

ID=53402438

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/064994 WO2015093077A1 (en) 2013-12-18 2014-06-05 Liquid-crystal display for heads-up display, and heads-up display

Country Status (6)

Country Link
US (1) US10067343B2 (en)
EP (1) EP3086169B1 (en)
JP (1) JP2015118272A (en)
KR (1) KR20160088397A (en)
CN (1) CN105829947B (en)
WO (1) WO2015093077A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3132308A1 (en) * 2014-04-17 2017-02-22 Valeo Comfort and Driving Assistance Image-generation system for head-up display and associated head-up display for a motor vehicle
WO2018015501A1 (en) * 2016-07-22 2018-01-25 Valeo Comfort And Driving Assistance Image generating device and head-up display
EP3451047A4 (en) * 2016-04-26 2019-11-20 Kyocera Corporation Display apparatus and vehicular head-up display

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3029353B1 (en) * 2014-11-28 2016-12-23 Valeo Comfort & Driving Assistance BACKLIGHT DEVICE, IN PARTICULAR FOR HIGH HEAD DISPLAY AND HIGH HEAD DISPLAY FOR MOTOR VEHICLE
JP6459921B2 (en) * 2015-11-19 2019-01-30 株式会社デンソー Head-up display device
JPWO2017131185A1 (en) * 2016-01-27 2018-10-25 京セラ株式会社 Head-up display device for vehicle
JP7249779B2 (en) * 2016-04-05 2023-03-31 ソニーグループ株式会社 Displays and electronics
JP6504127B2 (en) * 2016-07-21 2019-04-24 株式会社デンソー Vehicle display device
JP6721453B2 (en) * 2016-08-08 2020-07-15 マクセル株式会社 Head-up display device and its image display device
CN107870421A (en) * 2016-09-27 2018-04-03 上海蔚兰动力科技有限公司 The adjustable reflector of head-up display device and include its head-up display device
US10698257B2 (en) 2017-03-16 2020-06-30 Facebook Technologies, Llc Liquid crystal display backlight utilizing reflective stack
KR20190063858A (en) 2017-11-30 2019-06-10 현대자동차주식회사 Vehicular head-up display device using laser backlight and method for controlling the same
US20200133067A1 (en) * 2018-10-24 2020-04-30 GM Global Technology Operations LLC Display system with geometric back light module
JP7117066B2 (en) * 2019-02-15 2022-08-12 マクセル株式会社 Vehicle information display device and vehicle information display system
CN113711106B (en) * 2019-04-22 2023-10-13 株式会社小糸制作所 Head-up display for vehicle and light source unit for the same
CN212989777U (en) * 2019-05-17 2021-04-16 未来（北京）黑科技有限公司 Head-up display device
CN113109940A (en) * 2020-01-10 2021-07-13 未来（北京）黑科技有限公司 High-brightness head-up display system
JP7463872B2 (en) * 2020-06-17 2024-04-09 セイコーエプソン株式会社 Electro-optical devices and electronic equipment
US11620937B2 (en) 2020-07-14 2023-04-04 Samsung Electronics Co.. Ltd. Light source device and light emission control method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10221691A (en) 1997-02-06 1998-08-21 Fujitsu Ten Ltd Liquid crystal display device for hud
JP2003137004A (en) * 2001-10-31 2003-05-14 Nippon Seiki Co Ltd Display device for vehicle
JP2011100051A (en) * 2009-11-09 2011-05-19 Casio Computer Co Ltd Liquid crystal display device

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001022130A1 (en) * 1999-09-20 2001-03-29 3M Innovative Properties Company Optical films having at least one particle-containing layer
JP4042282B2 (en) * 2000-01-17 2008-02-06 株式会社デンソー Vehicle head-up display
JP2003015133A (en) * 2001-04-27 2003-01-15 Citizen Watch Co Ltd Liquid crystal display device
JP4122808B2 (en) * 2002-03-26 2008-07-23 セイコーエプソン株式会社 Liquid crystal display device and electronic device
DE10245933B4 (en) * 2002-09-30 2013-10-10 Osram Opto Semiconductors Gmbh Device for generating a bundled luminous flux
TWI282022B (en) * 2003-03-31 2007-06-01 Sharp Kk Surface lighting device and liquid crystal display device using the same
KR20060135153A (en) * 2005-06-24 2006-12-29 삼성전자주식회사 Liquid crystal display device
WO2007030447A2 (en) * 2005-09-06 2007-03-15 Wavien, Inc. Lcd display backlight system with improved color mixing and efficiency
JP2007219489A (en) 2006-01-19 2007-08-30 Epson Imaging Devices Corp Liquid crystal display device and head-up display using it
TWI370929B (en) * 2006-12-28 2012-08-21 Ind Tech Res Inst Backlight modules for displays and displays
FR2917191B1 (en) * 2007-06-11 2010-06-11 Commissariat Energie Atomique LIGHTING DEVICE FOR LIQUID CRYSTAL DISPLAY
US20090296024A1 (en) * 2008-03-18 2009-12-03 Sumitomo Chemical Company, Limited Light diffuser plate with primer layer, process for producing the same, laminated optical member, surface light source apparatus and liquid crystal display
KR101291923B1 (en) * 2009-07-13 2013-07-31 엘지디스플레이 주식회사 Liquid Crystal Display Device
JP2011088583A (en) 2009-10-26 2011-05-06 Nippon Seiki Co Ltd Illumination device
JP2011165624A (en) * 2010-02-15 2011-08-25 Yazaki Corp Vehicular backlight unit and vehicular display device
JP5877992B2 (en) * 2010-10-25 2016-03-08 株式会社半導体エネルギー研究所 Display device
WO2012077376A1 (en) * 2010-12-10 2012-06-14 凸版印刷株式会社 Liquid crystal display substrate and liquid crystal display device
US8964131B2 (en) * 2011-09-05 2015-02-24 Sharp Kabushiki Kaisha Illumination device, display device and television receiving device
JP5848631B2 (en) * 2012-02-23 2016-01-27 シャープ株式会社 LIGHTING DEVICE AND DISPLAY DEVICE HAVING THE SAME
JP5812444B2 (en) * 2012-04-13 2015-11-11 日東電工株式会社 Optical member, polarizing plate set and liquid crystal display device
JP6119490B2 (en) * 2013-07-31 2017-04-26 ソニー株式会社 Light source device and display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10221691A (en) 1997-02-06 1998-08-21 Fujitsu Ten Ltd Liquid crystal display device for hud
JP2003137004A (en) * 2001-10-31 2003-05-14 Nippon Seiki Co Ltd Display device for vehicle
JP2011100051A (en) * 2009-11-09 2011-05-19 Casio Computer Co Ltd Liquid crystal display device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3086169A4 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3132308A1 (en) * 2014-04-17 2017-02-22 Valeo Comfort and Driving Assistance Image-generation system for head-up display and associated head-up display for a motor vehicle
EP3451047A4 (en) * 2016-04-26 2019-11-20 Kyocera Corporation Display apparatus and vehicular head-up display
US10768417B2 (en) 2016-04-26 2020-09-08 Kyocera Corporation Display device and vehicle head-up display apparatus
WO2018015501A1 (en) * 2016-07-22 2018-01-25 Valeo Comfort And Driving Assistance Image generating device and head-up display
FR3054328A1 (en) * 2016-07-22 2018-01-26 Valeo Comfort And Driving Assistance IMAGE GENERATING DEVICE AND HIGH HEAD DISPLAY
CN109690370A (en) * 2016-07-22 2019-04-26 法雷奥舒适驾驶助手公司 Video generation device and head-up display
US11204496B2 (en) 2016-07-22 2021-12-21 Valeo Comfort And Driving Assistance Image generating device and head-up display

Also Published As

Publication number Publication date
EP3086169B1 (en) 2019-08-07
US10067343B2 (en) 2018-09-04
EP3086169A1 (en) 2016-10-26
CN105829947A (en) 2016-08-03
CN105829947B (en) 2019-01-22
US20160299341A1 (en) 2016-10-13
JP2015118272A (en) 2015-06-25
KR20160088397A (en) 2016-07-25
EP3086169A4 (en) 2017-08-16

Similar Documents

Publication Publication Date Title
WO2015093077A1 (en) Liquid-crystal display for heads-up display, and heads-up display
JP6200798B2 (en) Liquid crystal display device and head-up display device
JP6247952B2 (en) Head-up display device
JP4122808B2 (en) Liquid crystal display device and electronic device
KR102105748B1 (en) Liquid crystal display device and head-up display device
US11199741B2 (en) Display device
US11624958B2 (en) Display device
TWI610096B (en) Liquid crystal display device and head-up display device
US20170285384A1 (en) Liquid crystal display device and liquid crystal display system
US10620433B2 (en) Head-up display device
JP5454443B2 (en) Liquid crystal display
WO2024101246A1 (en) Liquid crystal display device
JP5177861B2 (en) Liquid crystal display
JP2001209048A (en) Liquid crystal display device
JP2009036879A (en) Liquid crystal display element
JP2017111179A (en) Display
JP2010033091A (en) Liquid crystal display element

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14871610

Country of ref document: EP

Kind code of ref document: A1

REEP Request for entry into the european phase

Ref document number: 2014871610

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2014871610

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 20167016318

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE